This is readline.info, produced by makeinfo version 7.1 from rlman.texi.

This manual describes the GNU Readline Library (version 8.3, 30 December
2024), a library which aids in the consistency of user interface across
discrete programs which provide a command line interface.

   Copyright © 1988-2025 Free Software Foundation, Inc.

     Permission is granted to copy, distribute and/or modify this
     document under the terms of the GNU Free Documentation License,
     Version 1.3 or any later version published by the Free Software
     Foundation; with no Invariant Sections, no Front-Cover Texts, and
     no Back-Cover Texts.  A copy of the license is included in the
     section entitled "GNU Free Documentation License".

INFO-DIR-SECTION Libraries
START-INFO-DIR-ENTRY
* Readline: (readline).       The GNU readline library API.
END-INFO-DIR-ENTRY


File: readline.info,  Node: Top,  Next: Command Line Editing,  Up: (dir)

GNU Readline Library
********************

This document describes the GNU Readline Library, a utility which aids
in the consistency of user interface across discrete programs which
provide a command line interface.  The Readline home page is
<http://www.gnu.org/software/readline/>.

* Menu:

* Command Line Editing::	   GNU Readline User's Manual.
* Programming with GNU Readline::  GNU Readline Programmer's Manual.
* GNU Free Documentation License::	License for copying this manual.
* Concept Index::		   Index of concepts described in this manual.
* Function and Variable Index::	   Index of externally visible functions
				   and variables.


File: readline.info,  Node: Command Line Editing,  Next: Programming with GNU Readline,  Prev: Top,  Up: Top

1 Command Line Editing
**********************

This chapter describes the basic features of the GNU command line
editing interface.

* Menu:

* Introduction and Notation::	Notation used in this text.
* Readline Interaction::	The minimum set of commands for editing a line.
* Readline Init File::		Customizing Readline from a user's view.
* Bindable Readline Commands::	A description of most of the Readline commands
				available for binding
* Readline vi Mode::		A short description of how to make Readline
				behave like the vi editor.


File: readline.info,  Node: Introduction and Notation,  Next: Readline Interaction,  Up: Command Line Editing

1.1 Introduction to Line Editing
================================

The following paragraphs use Emacs style to describe the notation used
to represent keystrokes.

   The text ‘C-k’ is read as 'Control-K' and describes the character
produced when the <k> key is pressed while the Control key is depressed.

   The text ‘M-k’ is read as 'Meta-K' and describes the character
produced when the Meta key (if you have one) is depressed, and the <k>
key is pressed (a “meta character”), then both are released.  The Meta
key is labeled <ALT> or <Option> on many keyboards.  On keyboards with
two keys labeled <ALT> (usually to either side of the space bar), the
<ALT> on the left side is generally set to work as a Meta key.  One of
the <ALT> keys may also be configured as some other modifier, such as a
Compose key for typing accented characters.

   On some keyboards, the Meta key modifier produces characters with the
eighth bit (0200) set.  You can use the ‘enable-meta-key’ variable to
control whether or not it does this, if the keyboard allows it.  On many
others, the terminal or terminal emulator converts the metafied key to a
key sequence beginning with <ESC> as described in the next paragraph.

   If you do not have a Meta or <ALT> key, or another key working as a
Meta key, you can generally achieve the latter effect by typing <ESC>
_first_, and then typing <k>.  The <ESC> character is known as the “meta
prefix”).

   Either process is known as “metafying” the <k> key.

   If your Meta key produces a key sequence with the <ESC> meta prefix,
you can make ‘M-key’ key bindings you specify (see ‘Key Bindings’ in
*note Readline Init File Syntax::) do the same thing by setting the
‘force-meta-prefix’ variable.

   The text ‘M-C-k’ is read as 'Meta-Control-k' and describes the
character produced by metafying ‘C-k’.

   In addition, several keys have their own names.  Specifically, <DEL>,
<ESC>, <LFD>, <SPC>, <RET>, and <TAB> all stand for themselves when seen
in this text, or in an init file (*note Readline Init File::).  If your
keyboard lacks a <LFD> key, typing <C-j> will output the appropriate
character.  The <RET> key may be labeled <Return> or <Enter> on some
keyboards.


File: readline.info,  Node: Readline Interaction,  Next: Readline Init File,  Prev: Introduction and Notation,  Up: Command Line Editing

1.2 Readline Interaction
========================

Often during an interactive session you type in a long line of text,
only to notice that the first word on the line is misspelled.  The
Readline library gives you a set of commands for manipulating the text
as you type it in, allowing you to just fix your typo, and not forcing
you to retype the majority of the line.  Using these editing commands,
you move the cursor to the place that needs correction, and delete or
insert the text of the corrections.  Then, when you are satisfied with
the line, you simply press <RET>.  You do not have to be at the end of
the line to press <RET>; the entire line is accepted regardless of the
location of the cursor within the line.

* Menu:

* Readline Bare Essentials::	The least you need to know about Readline.
* Readline Movement Commands::	Moving about the input line.
* Readline Killing Commands::	How to delete text, and how to get it back!
* Readline Arguments::		Giving numeric arguments to commands.
* Searching::			Searching through previous lines.


File: readline.info,  Node: Readline Bare Essentials,  Next: Readline Movement Commands,  Up: Readline Interaction

1.2.1 Readline Bare Essentials
------------------------------

In order to enter characters into the line, simply type them.  The typed
character appears where the cursor was, and then the cursor moves one
space to the right.  If you mistype a character, you can use your erase
character to back up and delete the mistyped character.

   Sometimes you may mistype a character, and not notice the error until
you have typed several other characters.  In that case, you can type
‘C-b’ to move the cursor to the left, and then correct your mistake.
Afterwards, you can move the cursor to the right with ‘C-f’.

   When you add text in the middle of a line, you will notice that
characters to the right of the cursor are 'pushed over' to make room for
the text that you have inserted.  Likewise, when you delete text behind
the cursor, characters to the right of the cursor are 'pulled back' to
fill in the blank space created by the removal of the text.  These are
the bare essentials for editing the text of an input line:

‘C-b’
     Move back one character.
‘C-f’
     Move forward one character.
<DEL> or <Backspace>
     Delete the character to the left of the cursor.
‘C-d’
     Delete the character underneath the cursor.
Printing characters
     Insert the character into the line at the cursor.
‘C-_’ or ‘C-x C-u’
     Undo the last editing command.  You can undo all the way back to an
     empty line.

Depending on your configuration, the <Backspace> key might be set to
delete the character to the left of the cursor and the <DEL> key set to
delete the character underneath the cursor, like ‘C-d’, rather than the
character to the left of the cursor.


File: readline.info,  Node: Readline Movement Commands,  Next: Readline Killing Commands,  Prev: Readline Bare Essentials,  Up: Readline Interaction

1.2.2 Readline Movement Commands
--------------------------------

The above table describes the most basic keystrokes that you need in
order to do editing of the input line.  For your convenience, many other
commands are available in addition to ‘C-b’, ‘C-f’, ‘C-d’, and <DEL>.
Here are some commands for moving more rapidly within the line.

‘C-a’
     Move to the start of the line.
‘C-e’
     Move to the end of the line.
‘M-f’
     Move forward a word, where a word is composed of letters and
     digits.
‘M-b’
     Move backward a word.
‘C-l’
     Clear the screen, reprinting the current line at the top.

   Notice how ‘C-f’ moves forward a character, while ‘M-f’ moves forward
a word.  It is a loose convention that control keystrokes operate on
characters while meta keystrokes operate on words.


File: readline.info,  Node: Readline Killing Commands,  Next: Readline Arguments,  Prev: Readline Movement Commands,  Up: Readline Interaction

1.2.3 Readline Killing Commands
-------------------------------

“Killing” text means to delete the text from the line, but to save it
away for later use, usually by “yanking” (re-inserting) it back into the
line.  ('Cut' and 'paste' are more recent jargon for 'kill' and 'yank'.)

   If the description for a command says that it 'kills' text, then you
can be sure that you can get the text back in a different (or the same)
place later.

   When you use a kill command, the text is saved in a “kill-ring”.  Any
number of consecutive kills save all of the killed text together, so
that when you yank it back, you get it all.  The kill ring is not line
specific; the text that you killed on a previously typed line is
available to be yanked back later, when you are typing another line.

   Here is the list of commands for killing text.

‘C-k’
     Kill the text from the current cursor position to the end of the
     line.

‘M-d’
     Kill from the cursor to the end of the current word, or, if between
     words, to the end of the next word.  Word boundaries are the same
     as those used by ‘M-f’.

‘M-<DEL>’
     Kill from the cursor to the start of the current word, or, if
     between words, to the start of the previous word.  Word boundaries
     are the same as those used by ‘M-b’.

‘C-w’
     Kill from the cursor to the previous whitespace.  This is different
     than ‘M-<DEL>’ because the word boundaries differ.

   Here is how to “yank” the text back into the line.  Yanking means to
copy the most-recently-killed text from the kill buffer into the line at
the current cursor position.

‘C-y’
     Yank the most recently killed text back into the buffer at the
     cursor.

‘M-y’
     Rotate the kill-ring, and yank the new top.  You can only do this
     if the prior command is ‘C-y’ or ‘M-y’.


File: readline.info,  Node: Readline Arguments,  Next: Searching,  Prev: Readline Killing Commands,  Up: Readline Interaction

1.2.4 Readline Arguments
------------------------

You can pass numeric arguments to Readline commands.  Sometimes the
argument acts as a repeat count, other times it is the sign of the
argument that is significant.  If you pass a negative argument to a
command which normally acts in a forward direction, that command will
act in a backward direction.  For example, to kill text back to the
start of the line, you might type ‘M-- C-k’.

   The general way to pass numeric arguments to a command is to type
meta digits before the command.  If the first 'digit' typed is a minus
sign (‘-’), then the sign of the argument will be negative.  Once you
have typed one meta digit to get the argument started, you can type the
remainder of the digits, and then the command.  For example, to give the
‘C-d’ command an argument of 10, you could type ‘M-1 0 C-d’, which will
delete the next ten characters on the input line.


File: readline.info,  Node: Searching,  Prev: Readline Arguments,  Up: Readline Interaction

1.2.5 Searching for Commands in the History
-------------------------------------------

Readline provides commands for searching through the command history for
lines containing a specified string.  There are two search modes:
“incremental” and “non-incremental”.

   Incremental searches begin before the user has finished typing the
search string.  As each character of the search string is typed,
Readline displays the next entry from the history matching the string
typed so far.  An incremental search requires only as many characters as
needed to find the desired history entry.  When using emacs editing
mode, type ‘C-r’ to search backward in the history for a particular
string.  Typing ‘C-s’ searches forward through the history.  The
characters present in the value of the ‘isearch-terminators’ variable
are used to terminate an incremental search.  If that variable has not
been assigned a value, the <ESC> and ‘C-j’ characters terminate an
incremental search.  ‘C-g’ aborts an incremental search and restores the
original line.  When the search is terminated, the history entry
containing the search string becomes the current line.

   To find other matching entries in the history list, type ‘C-r’ or
‘C-s’ as appropriate.  This searches backward or forward in the history
for the next entry matching the search string typed so far.  Any other
key sequence bound to a Readline command terminates the search and
executes that command.  For instance, a <RET> terminates the search and
accepts the line, thereby executing the command from the history list.
A movement command will terminate the search, make the last line found
the current line, and begin editing.

   Readline remembers the last incremental search string.  If two ‘C-r’s
are typed without any intervening characters defining a new search
string, Readline uses any remembered search string.

   Non-incremental searches read the entire search string before
starting to search for matching history entries.  The search string may
be typed by the user or be part of the contents of the current line.


File: readline.info,  Node: Readline Init File,  Next: Bindable Readline Commands,  Prev: Readline Interaction,  Up: Command Line Editing

1.3 Readline Init File
======================

Although the Readline library comes with a set of Emacs-like keybindings
installed by default, it is possible to use a different set of
keybindings.  Any user can customize programs that use Readline by
putting commands in an “inputrc” file, conventionally in their home
directory.  The name of this file is taken from the value of the
environment variable ‘INPUTRC’.  If that variable is unset, the default
is ‘~/.inputrc’.  If that file does not exist or cannot be read,
Readline looks for ‘/etc/inputrc’.

   When a program that uses the Readline library starts up, Readline
reads the init file and sets any variables and key bindings it contains.

   In addition, the ‘C-x C-r’ command re-reads this init file, thus
incorporating any changes that you might have made to it.

* Menu:

* Readline Init File Syntax::	Syntax for the commands in the inputrc file.
* Conditional Init Constructs::	Conditional key bindings in the inputrc file.
* Sample Init File::		An example inputrc file.


File: readline.info,  Node: Readline Init File Syntax,  Next: Conditional Init Constructs,  Up: Readline Init File

1.3.1 Readline Init File Syntax
-------------------------------

There are only a few basic constructs allowed in the Readline init file.
Blank lines are ignored.  Lines beginning with a ‘#’ are comments.
Lines beginning with a ‘$’ indicate conditional constructs (*note
Conditional Init Constructs::).  Other lines denote variable settings
and key bindings.

Variable Settings
     You can modify the run-time behavior of Readline by altering the
     values of variables in Readline using the ‘set’ command within the
     init file.  The syntax is simple:

          set VARIABLE VALUE

     Here, for example, is how to change from the default Emacs-like key
     binding to use ‘vi’ line editing commands:

          set editing-mode vi

     Variable names and values, where appropriate, are recognized
     without regard to case.  Unrecognized variable names are ignored.

     Boolean variables (those that can be set to on or off) are set to
     on if the value is null or empty, ON (case-insensitive), or 1.  Any
     other value results in the variable being set to off.

     A great deal of run-time behavior is changeable with the following
     variables.

     ‘active-region-start-color’
          A string variable that controls the text color and background
          when displaying the text in the active region (see the
          description of ‘enable-active-region’ below).  This string
          must not take up any physical character positions on the
          display, so it should consist only of terminal escape
          sequences.  It is output to the terminal before displaying the
          text in the active region.  This variable is reset to the
          default value whenever the terminal type changes.  The default
          value is the string that puts the terminal in standout mode,
          as obtained from the terminal's terminfo description.  A
          sample value might be ‘\e[01;33m’.

     ‘active-region-end-color’
          A string variable that "undoes" the effects of
          ‘active-region-start-color’ and restores "normal" terminal
          display appearance after displaying text in the active region.
          This string must not take up any physical character positions
          on the display, so it should consist only of terminal escape
          sequences.  It is output to the terminal after displaying the
          text in the active region.  This variable is reset to the
          default value whenever the terminal type changes.  The default
          value is the string that restores the terminal from standout
          mode, as obtained from the terminal's terminfo description.  A
          sample value might be ‘\e[0m’.

     ‘bell-style’
          Controls what happens when Readline wants to ring the terminal
          bell.  If set to ‘none’, Readline never rings the bell.  If
          set to ‘visible’, Readline uses a visible bell if one is
          available.  If set to ‘audible’ (the default), Readline
          attempts to ring the terminal's bell.

     ‘bind-tty-special-chars’
          If set to ‘on’ (the default), Readline attempts to bind the
          control characters that are treated specially by the kernel's
          terminal driver to their Readline equivalents.  These override
          the default Readline bindings described here.  Type ‘stty -a’
          at a Bash prompt to see your current terminal settings,
          including the special control characters (usually ‘cchars’).

     ‘blink-matching-paren’
          If set to ‘on’, Readline attempts to briefly move the cursor
          to an opening parenthesis when a closing parenthesis is
          inserted.  The default is ‘off’.

     ‘colored-completion-prefix’
          If set to ‘on’, when listing completions, Readline displays
          the common prefix of the set of possible completions using a
          different color.  The color definitions are taken from the
          value of the ‘LS_COLORS’ environment variable.  If there is a
          color definition in ‘LS_COLORS’ for the custom suffix
          ‘readline-colored-completion-prefix’, Readline uses this color
          for the common prefix instead of its default.  The default is
          ‘off’.

     ‘colored-stats’
          If set to ‘on’, Readline displays possible completions using
          different colors to indicate their file type.  The color
          definitions are taken from the value of the ‘LS_COLORS’
          environment variable.  The default is ‘off’.

     ‘comment-begin’
          The string to insert at the beginning of the line by the
          ‘insert-comment’ command.  The default value is ‘"#"’.

     ‘completion-display-width’
          The number of screen columns used to display possible matches
          when performing completion.  The value is ignored if it is
          less than 0 or greater than the terminal screen width.  A
          value of 0 causes matches to be displayed one per line.  The
          default value is -1.

     ‘completion-ignore-case’
          If set to ‘on’, Readline performs filename matching and
          completion in a case-insensitive fashion.  The default value
          is ‘off’.

     ‘completion-map-case’
          If set to ‘on’, and COMPLETION-IGNORE-CASE is enabled,
          Readline treats hyphens (‘-’) and underscores (‘_’) as
          equivalent when performing case-insensitive filename matching
          and completion.  The default value is ‘off’.

     ‘completion-prefix-display-length’
          The maximum length in characters of the common prefix of a
          list of possible completions that is displayed without
          modification.  When set to a value greater than zero, Readline
          replaces common prefixes longer than this value with an
          ellipsis when displaying possible completions.  If a
          completion begins with a period, and Readline is completing
          filenames, it uses three underscores instead of an ellipsis.

     ‘completion-query-items’
          The number of possible completions that determines when the
          user is asked whether the list of possibilities should be
          displayed.  If the number of possible completions is greater
          than or equal to this value, Readline asks whether or not the
          user wishes to view them; otherwise, Readline simply lists the
          completions.  This variable must be set to an integer value
          greater than or equal to zero.  A zero value means Readline
          should never ask; negative values are treated as zero.  The
          default limit is ‘100’.

     ‘convert-meta’
          If set to ‘on’, Readline converts characters it reads that
          have the eighth bit set to an ASCII key sequence by clearing
          the eighth bit and prefixing an <ESC> character, converting
          them to a meta-prefixed key sequence.  The default value is
          ‘on’, but Readline sets it to ‘off’ if the locale contains
          characters whose encodings may include bytes with the eighth
          bit set.  This variable is dependent on the ‘LC_CTYPE’ locale
          category, and may change if the locale changes.  This variable
          also affects key bindings; see the description of
          ‘force-meta-prefix’ below.

     ‘disable-completion’
          If set to ‘On’, Readline inhibits word completion.  Completion
          characters are inserted into the line as if they had been
          mapped to ‘self-insert’.  The default is ‘off’.

     ‘echo-control-characters’
          When set to ‘on’, on operating systems that indicate they
          support it, Readline echoes a character corresponding to a
          signal generated from the keyboard.  The default is ‘on’.

     ‘editing-mode’
          The ‘editing-mode’ variable controls the default set of key
          bindings.  By default, Readline starts up in emacs editing
          mode, where the keystrokes are most similar to Emacs.  This
          variable can be set to either ‘emacs’ or ‘vi’.

     ‘emacs-mode-string’
          If the SHOW-MODE-IN-PROMPT variable is enabled, this string is
          displayed immediately before the last line of the primary
          prompt when emacs editing mode is active.  The value is
          expanded like a key binding, so the standard set of meta- and
          control- prefixes and backslash escape sequences is available.
          The ‘\1’ and ‘\2’ escapes begin and end sequences of
          non-printing characters, which can be used to embed a terminal
          control sequence into the mode string.  The default is ‘@’.

     ‘enable-active-region’
          “point” is the current cursor position, and “mark” refers to a
          saved cursor position (*note Commands For Moving::).  The text
          between the point and mark is referred to as the “region”.
          When this variable is set to ‘On’, Readline allows certain
          commands to designate the region as “active”.  When the region
          is active, Readline highlights the text in the region using
          the value of the ‘active-region-start-color’, which defaults
          to the string that enables the terminal's standout mode.  The
          active region shows the text inserted by bracketed-paste and
          any matching text found by incremental and non-incremental
          history searches.  The default is ‘On’.

     ‘enable-bracketed-paste’
          When set to ‘On’, Readline configures the terminal to insert
          each paste into the editing buffer as a single string of
          characters, instead of treating each character as if it had
          been read from the keyboard.  This is called putting the
          terminal into “bracketed paste mode”; it prevents Readline
          from executing any editing commands bound to key sequences
          appearing in the pasted text.  The default is ‘On’.

     ‘enable-keypad’
          When set to ‘on’, Readline tries to enable the application
          keypad when it is called.  Some systems need this to enable
          the arrow keys.  The default is ‘off’.

     ‘enable-meta-key’
          When set to ‘on’, Readline tries to enable any meta modifier
          key the terminal claims to support when it is called.  On many
          terminals, the Meta key is used to send eight-bit characters;
          this variable checks for the terminal capability that
          indicates the terminal can enable and disable a mode that sets
          the eighth bit of a character (0200) if the Meta key is held
          down when the character is typed (a meta character).  The
          default is ‘on’.

     ‘expand-tilde’
          If set to ‘on’, Readline attempts tilde expansion when it
          attempts word completion.  The default is ‘off’.

     ‘force-meta-prefix’
          If set to ‘on’, Readline modifies its behavior when binding
          key sequences containing ‘\M-’ or ‘Meta-’ (see ‘Key Bindings’
          in *note Readline Init File Syntax::) by converting a key
          sequence of the form ‘\M-’C or ‘Meta-’C to the two-character
          sequence ‘ESC’ C (adding the meta prefix).  If
          ‘force-meta-prefix’ is set to ‘off’ (the default), Readline
          uses the value of the ‘convert-meta’ variable to determine
          whether to perform this conversion: if ‘convert-meta’ is ‘on’,
          Readline performs the conversion described above; if it is
          ‘off’, Readline converts C to a meta character by setting the
          eighth bit (0200).  The default is ‘off’.

     ‘history-preserve-point’
          If set to ‘on’, the history code attempts to place the point
          (the current cursor position) at the same location on each
          history line retrieved with ‘previous-history’ or
          ‘next-history’.  The default is ‘off’.

     ‘history-size’
          Set the maximum number of history entries saved in the history
          list.  If set to zero, any existing history entries are
          deleted and no new entries are saved.  If set to a value less
          than zero, the number of history entries is not limited.  By
          default, the number of history entries is not limited.  If you
          try to set HISTORY-SIZE to a non-numeric value, the maximum
          number of history entries will be set to 500.

     ‘horizontal-scroll-mode’
          Setting this variable to ‘on’ means that the text of the lines
          being edited will scroll horizontally on a single screen line
          when the lines are longer than the width of the screen,
          instead of wrapping onto a new screen line.  This variable is
          automatically set to ‘on’ for terminals of height 1.  By
          default, this variable is set to ‘off’.

     ‘input-meta’
          If set to ‘on’, Readline enables eight-bit input (that is, it
          does not clear the eighth bit in the characters it reads),
          regardless of what the terminal claims it can support.  The
          default value is ‘off’, but Readline sets it to ‘on’ if the
          locale contains characters whose encodings may include bytes
          with the eighth bit set.  This variable is dependent on the
          ‘LC_CTYPE’ locale category, and its value may change if the
          locale changes.  The name ‘meta-flag’ is a synonym for
          ‘input-meta’.

     ‘isearch-terminators’
          The string of characters that should terminate an incremental
          search without subsequently executing the character as a
          command (*note Searching::).  If this variable has not been
          given a value, the characters <ESC> and ‘C-j’ terminate an
          incremental search.

     ‘keymap’
          Sets Readline's idea of the current keymap for key binding
          commands.  Built-in ‘keymap’ names are ‘emacs’,
          ‘emacs-standard’, ‘emacs-meta’, ‘emacs-ctlx’, ‘vi’, ‘vi-move’,
          ‘vi-command’, and ‘vi-insert’.  ‘vi’ is equivalent to
          ‘vi-command’ (‘vi-move’ is also a synonym); ‘emacs’ is
          equivalent to ‘emacs-standard’.  Applications may add
          additional names.  The default value is ‘emacs’; the value of
          the ‘editing-mode’ variable also affects the default keymap.

     ‘keyseq-timeout’
          Specifies the duration Readline will wait for a character when
          reading an ambiguous key sequence (one that can form a
          complete key sequence using the input read so far, or can take
          additional input to complete a longer key sequence).  If
          Readline doesn't receive any input within the timeout, it uses
          the shorter but complete key sequence.  Readline uses this
          value to determine whether or not input is available on the
          current input source (‘rl_instream’ by default).  The value is
          specified in milliseconds, so a value of 1000 means that
          Readline will wait one second for additional input.  If this
          variable is set to a value less than or equal to zero, or to a
          non-numeric value, Readline waits until another key is pressed
          to decide which key sequence to complete.  The default value
          is ‘500’.

     ‘mark-directories’
          If set to ‘on’, completed directory names have a slash
          appended.  The default is ‘on’.

     ‘mark-modified-lines’
          When this variable is set to ‘on’, Readline displays an
          asterisk (‘*’) at the start of history lines which have been
          modified.  This variable is ‘off’ by default.

     ‘mark-symlinked-directories’
          If set to ‘on’, completed names which are symbolic links to
          directories have a slash appended, subject to the value of
          ‘mark-directories’.  The default is ‘off’.

     ‘match-hidden-files’
          This variable, when set to ‘on’, forces Readline to match
          files whose names begin with a ‘.’ (hidden files) when
          performing filename completion.  If set to ‘off’, the user
          must include the leading ‘.’ in the filename to be completed.
          This variable is ‘on’ by default.

     ‘menu-complete-display-prefix’
          If set to ‘on’, menu completion displays the common prefix of
          the list of possible completions (which may be empty) before
          cycling through the list.  The default is ‘off’.

     ‘output-meta’
          If set to ‘on’, Readline displays characters with the eighth
          bit set directly rather than as a meta-prefixed escape
          sequence.  The default is ‘off’, but Readline sets it to ‘on’
          if the locale contains characters whose encodings may include
          bytes with the eighth bit set.  This variable is dependent on
          the ‘LC_CTYPE’ locale category, and its value may change if
          the locale changes.

     ‘page-completions’
          If set to ‘on’, Readline uses an internal pager resembling
          more(1) to display a screenful of possible completions at a
          time.  This variable is ‘on’ by default.

     ‘prefer-visible-bell’
          See ‘bell-style’.

     ‘print-completions-horizontally’
          If set to ‘on’, Readline displays completions with matches
          sorted horizontally in alphabetical order, rather than down
          the screen.  The default is ‘off’.

     ‘revert-all-at-newline’
          If set to ‘on’, Readline will undo all changes to history
          lines before returning when executing ‘accept-line’.  By
          default, history lines may be modified and retain individual
          undo lists across calls to ‘readline()’.  The default is
          ‘off’.

     ‘search-ignore-case’
          If set to ‘on’, Readline performs incremental and
          non-incremental history list searches in a case-insensitive
          fashion.  The default value is ‘off’.

     ‘show-all-if-ambiguous’
          This alters the default behavior of the completion functions.
          If set to ‘on’, words which have more than one possible
          completion cause the matches to be listed immediately instead
          of ringing the bell.  The default value is ‘off’.

     ‘show-all-if-unmodified’
          This alters the default behavior of the completion functions
          in a fashion similar to SHOW-ALL-IF-AMBIGUOUS.  If set to
          ‘on’, words which have more than one possible completion
          without any possible partial completion (the possible
          completions don't share a common prefix) cause the matches to
          be listed immediately instead of ringing the bell.  The
          default value is ‘off’.

     ‘show-mode-in-prompt’
          If set to ‘on’, add a string to the beginning of the prompt
          indicating the editing mode: emacs, vi command, or vi
          insertion.  The mode strings are user-settable (e.g.,
          EMACS-MODE-STRING).  The default value is ‘off’.

     ‘skip-completed-text’
          If set to ‘on’, this alters the default completion behavior
          when inserting a single match into the line.  It's only active
          when performing completion in the middle of a word.  If
          enabled, Readline does not insert characters from the
          completion that match characters after point in the word being
          completed, so portions of the word following the cursor are
          not duplicated.  For instance, if this is enabled, attempting
          completion when the cursor is after the first ‘e’ in
          ‘Makefile’ will result in ‘Makefile’ rather than
          ‘Makefilefile’, assuming there is a single possible
          completion.  The default value is ‘off’.

     ‘vi-cmd-mode-string’
          If the SHOW-MODE-IN-PROMPT variable is enabled, this string is
          displayed immediately before the last line of the primary
          prompt when vi editing mode is active and in command mode.
          The value is expanded like a key binding, so the standard set
          of meta- and control- prefixes and backslash escape sequences
          is available.  The ‘\1’ and ‘\2’ escapes begin and end
          sequences of non-printing characters, which can be used to
          embed a terminal control sequence into the mode string.  The
          default is ‘(cmd)’.

     ‘vi-ins-mode-string’
          If the SHOW-MODE-IN-PROMPT variable is enabled, this string is
          displayed immediately before the last line of the primary
          prompt when vi editing mode is active and in insertion mode.
          The value is expanded like a key binding, so the standard set
          of meta- and control- prefixes and backslash escape sequences
          is available.  The ‘\1’ and ‘\2’ escapes begin and end
          sequences of non-printing characters, which can be used to
          embed a terminal control sequence into the mode string.  The
          default is ‘(ins)’.

     ‘visible-stats’
          If set to ‘on’, a character denoting a file's type is appended
          to the filename when listing possible completions.  The
          default is ‘off’.

Key Bindings
     The syntax for controlling key bindings in the init file is simple.
     First you need to find the name of the command that you want to
     change.  The following sections contain tables of the command name,
     the default keybinding, if any, and a short description of what the
     command does.

     Once you know the name of the command, simply place on a line in
     the init file the name of the key you wish to bind the command to,
     a colon, and then the name of the command.  There can be no space
     between the key name and the colon - that will be interpreted as
     part of the key name.  The name of the key can be expressed in
     different ways, depending on what you find most comfortable.

     In addition to command names, Readline allows keys to be bound to a
     string that is inserted when the key is pressed (a MACRO).  The
     difference between a macro and a command is that a macro is
     enclosed in single or double quotes.

     KEYNAME: FUNCTION-NAME or MACRO
          KEYNAME is the name of a key spelled out in English.  For
          example:
               Control-u: universal-argument
               Meta-Rubout: backward-kill-word
               Control-o: "> output"

          In the example above, ‘C-u’ is bound to the function
          ‘universal-argument’, ‘M-DEL’ is bound to the function
          ‘backward-kill-word’, and ‘C-o’ is bound to run the macro
          expressed on the right hand side (that is, to insert the text
          ‘> output’ into the line).

          This key binding syntax recognizes a number of symbolic
          character names: DEL, ESC, ESCAPE, LFD, NEWLINE, RET, RETURN,
          RUBOUT (a destructive backspace), SPACE, SPC, and TAB.

     "KEYSEQ": FUNCTION-NAME or MACRO
          KEYSEQ differs from KEYNAME above in that strings denoting an
          entire key sequence can be specified, by placing the key
          sequence in double quotes.  Some GNU Emacs style key escapes
          can be used, as in the following example, but none of the
          special character names are recognized.

               "\C-u": universal-argument
               "\C-x\C-r": re-read-init-file
               "\e[11~": "Function Key 1"

          In the above example, ‘C-u’ is again bound to the function
          ‘universal-argument’ (just as it was in the first example),
          ‘‘C-x’ ‘C-r’’ is bound to the function ‘re-read-init-file’,
          and ‘<ESC> <[> <1> <1> <~>’ is bound to insert the text
          ‘Function Key 1’.

     The following GNU Emacs style escape sequences are available when
     specifying key sequences:

     ‘\C-’
          A control prefix.
     ‘\M-’
          Adding the meta prefix or converting the following character
          to a meta character, as described above under
          ‘force-meta-prefix’ (see ‘Variable Settings’ in *note Readline
          Init File Syntax::).
     ‘\e’
          An escape character.
     ‘\\’
          Backslash.
     ‘\"’
          <">, a double quotation mark.
     ‘\'’
          <'>, a single quote or apostrophe.

     In addition to the GNU Emacs style escape sequences, a second set
     of backslash escapes is available:

     ‘\a’
          alert (bell)
     ‘\b’
          backspace
     ‘\d’
          delete
     ‘\f’
          form feed
     ‘\n’
          newline
     ‘\r’
          carriage return
     ‘\t’
          horizontal tab
     ‘\v’
          vertical tab
     ‘\NNN’
          The eight-bit character whose value is the octal value NNN
          (one to three digits).
     ‘\xHH’
          The eight-bit character whose value is the hexadecimal value
          HH (one or two hex digits).

     When entering the text of a macro, single or double quotes must be
     used to indicate a macro definition.  Unquoted text is assumed to
     be a function name.  The backslash escapes described above are
     expanded in the macro body.  Backslash will quote any other
     character in the macro text, including ‘"’ and ‘'’.  For example,
     the following binding will make ‘‘C-x’ \’ insert a single ‘\’ into
     the line:
          "\C-x\\": "\\"


File: readline.info,  Node: Conditional Init Constructs,  Next: Sample Init File,  Prev: Readline Init File Syntax,  Up: Readline Init File

1.3.2 Conditional Init Constructs
---------------------------------

Readline implements a facility similar in spirit to the conditional
compilation features of the C preprocessor which allows key bindings and
variable settings to be performed as the result of tests.  There are
four parser directives available.

‘$if’
     The ‘$if’ construct allows bindings to be made based on the editing
     mode, the terminal being used, or the application using Readline.
     The text of the test, after any comparison operator, extends to the
     end of the line; unless otherwise noted, no characters are required
     to isolate it.

     ‘mode’
          The ‘mode=’ form of the ‘$if’ directive is used to test
          whether Readline is in ‘emacs’ or ‘vi’ mode.  This may be used
          in conjunction with the ‘set keymap’ command, for instance, to
          set bindings in the ‘emacs-standard’ and ‘emacs-ctlx’ keymaps
          only if Readline is starting out in ‘emacs’ mode.

     ‘term’
          The ‘term=’ form may be used to include terminal-specific key
          bindings, perhaps to bind the key sequences output by the
          terminal's function keys.  The word on the right side of the
          ‘=’ is tested against both the full name of the terminal and
          the portion of the terminal name before the first ‘-’.  This
          allows ‘xterm’ to match both ‘xterm’ and ‘xterm-256color’, for
          instance.

     ‘version’
          The ‘version’ test may be used to perform comparisons against
          specific Readline versions.  The ‘version’ expands to the
          current Readline version.  The set of comparison operators
          includes ‘=’ (and ‘==’), ‘!=’, ‘<=’, ‘>=’, ‘<’, and ‘>’.  The
          version number supplied on the right side of the operator
          consists of a major version number, an optional decimal point,
          and an optional minor version (e.g., ‘7.1’).  If the minor
          version is omitted, it defaults to ‘0’.  The operator may be
          separated from the string ‘version’ and from the version
          number argument by whitespace.  The following example sets a
          variable if the Readline version being used is 7.0 or newer:
               $if version >= 7.0
               set show-mode-in-prompt on
               $endif

     ‘application’
          The APPLICATION construct is used to include
          application-specific settings.  Each program using the
          Readline library sets the APPLICATION NAME, and you can test
          for a particular value.  This could be used to bind key
          sequences to functions useful for a specific program.  For
          instance, the following command adds a key sequence that
          quotes the current or previous word in Bash:
               $if Bash
               # Quote the current or previous word
               "\C-xq": "\eb\"\ef\""
               $endif

     ‘variable’
          The VARIABLE construct provides simple equality tests for
          Readline variables and values.  The permitted comparison
          operators are ‘=’, ‘==’, and ‘!=’.  The variable name must be
          separated from the comparison operator by whitespace; the
          operator may be separated from the value on the right hand
          side by whitespace.  String and boolean variables may be
          tested.  Boolean variables must be tested against the values
          ON and OFF.  The following example is equivalent to the
          ‘mode=emacs’ test described above:
               $if editing-mode == emacs
               set show-mode-in-prompt on
               $endif

‘$else’
     Commands in this branch of the ‘$if’ directive are executed if the
     test fails.

‘$endif’
     This command, as seen in the previous example, terminates an ‘$if’
     command.

‘$include’
     This directive takes a single filename as an argument and reads
     commands and key bindings from that file.  For example, the
     following directive reads from ‘/etc/inputrc’:
          $include /etc/inputrc


File: readline.info,  Node: Sample Init File,  Prev: Conditional Init Constructs,  Up: Readline Init File

1.3.3 Sample Init File
----------------------

Here is an example of an INPUTRC file.  This illustrates key binding,
variable assignment, and conditional syntax.

     # This file controls the behavior of line input editing for
     # programs that use the GNU Readline library.  Existing
     # programs include FTP, Bash, and GDB.
     #
     # You can re-read the inputrc file with C-x C-r.
     # Lines beginning with '#' are comments.
     #
     # First, include any system-wide bindings and variable
     # assignments from /etc/Inputrc
     $include /etc/Inputrc

     #
     # Set various bindings for emacs mode.

     set editing-mode emacs

     $if mode=emacs

     Meta-Control-h:	backward-kill-word	Text after the function name is ignored

     #
     # Arrow keys in keypad mode
     #
     #"\M-OD":        backward-char
     #"\M-OC":        forward-char
     #"\M-OA":        previous-history
     #"\M-OB":        next-history
     #
     # Arrow keys in ANSI mode
     #
     "\M-[D":        backward-char
     "\M-[C":        forward-char
     "\M-[A":        previous-history
     "\M-[B":        next-history
     #
     # Arrow keys in 8 bit keypad mode
     #
     #"\M-\C-OD":       backward-char
     #"\M-\C-OC":       forward-char
     #"\M-\C-OA":       previous-history
     #"\M-\C-OB":       next-history
     #
     # Arrow keys in 8 bit ANSI mode
     #
     #"\M-\C-[D":       backward-char
     #"\M-\C-[C":       forward-char
     #"\M-\C-[A":       previous-history
     #"\M-\C-[B":       next-history

     C-q: quoted-insert

     $endif

     # An old-style binding.  This happens to be the default.
     TAB: complete

     # Macros that are convenient for shell interaction
     $if Bash
     # edit the path
     "\C-xp": "PATH=${PATH}\e\C-e\C-a\ef\C-f"
     # prepare to type a quoted word --
     # insert open and close double quotes
     # and move to just after the open quote
     "\C-x\"": "\"\"\C-b"
     # insert a backslash (testing backslash escapes
     # in sequences and macros)
     "\C-x\\": "\\"
     # Quote the current or previous word
     "\C-xq": "\eb\"\ef\""
     # Add a binding to refresh the line, which is unbound
     "\C-xr": redraw-current-line
     # Edit variable on current line.
     "\M-\C-v": "\C-a\C-k$\C-y\M-\C-e\C-a\C-y="
     $endif

     # use a visible bell if one is available
     set bell-style visible

     # don't strip characters to 7 bits when reading
     set input-meta on

     # allow iso-latin1 characters to be inserted rather
     # than converted to prefix-meta sequences
     set convert-meta off

     # display characters with the eighth bit set directly
     # rather than as meta-prefixed characters
     set output-meta on

     # if there are 150 or more possible completions for a word,
     # ask whether or not the user wants to see all of them
     set completion-query-items 150

     # For FTP
     $if Ftp
     "\C-xg": "get \M-?"
     "\C-xt": "put \M-?"
     "\M-.": yank-last-arg
     $endif


File: readline.info,  Node: Bindable Readline Commands,  Next: Readline vi Mode,  Prev: Readline Init File,  Up: Command Line Editing

1.4 Bindable Readline Commands
==============================

* Menu:

* Commands For Moving::		Moving about the line.
* Commands For History::	Getting at previous lines.
* Commands For Text::		Commands for changing text.
* Commands For Killing::	Commands for killing and yanking.
* Numeric Arguments::		Specifying numeric arguments, repeat counts.
* Commands For Completion::	Getting Readline to do the typing for you.
* Keyboard Macros::		Saving and re-executing typed characters
* Miscellaneous Commands::	Other miscellaneous commands.

This section describes Readline commands that may be bound to key
sequences.  Command names without an accompanying key sequence are
unbound by default.

   In the following descriptions, “point” refers to the current cursor
position, and “mark” refers to a cursor position saved by the ‘set-mark’
command.  The text between the point and mark is referred to as the
“region”.  Readline has the concept of an _active region_: when the
region is active, Readline redisplay highlights the region using the
value of the ‘active-region-start-color’ variable.  The
‘enable-active-region’ variable turns this on and off.  Several commands
set the region to active; those are noted below.


File: readline.info,  Node: Commands For Moving,  Next: Commands For History,  Up: Bindable Readline Commands

1.4.1 Commands For Moving
-------------------------

‘beginning-of-line (C-a)’
     Move to the start of the current line.  This may also be bound to
     the Home key on some keyboards.

‘end-of-line (C-e)’
     Move to the end of the line.  This may also be bound to the End key
     on some keyboards.

‘forward-char (C-f)’
     Move forward a character.  This may also be bound to the right
     arrow key on some keyboards.

‘backward-char (C-b)’
     Move back a character.  This may also be bound to the left arrow
     key on some keyboards.

‘forward-word (M-f)’
     Move forward to the end of the next word.  Words are composed of
     letters and digits.

‘backward-word (M-b)’
     Move back to the start of the current or previous word.  Words are
     composed of letters and digits.

‘previous-screen-line ()’
     Attempt to move point to the same physical screen column on the
     previous physical screen line.  This will not have the desired
     effect if the current Readline line does not take up more than one
     physical line or if point is not greater than the length of the
     prompt plus the screen width.

‘next-screen-line ()’
     Attempt to move point to the same physical screen column on the
     next physical screen line.  This will not have the desired effect
     if the current Readline line does not take up more than one
     physical line or if the length of the current Readline line is not
     greater than the length of the prompt plus the screen width.

‘clear-display (M-C-l)’
     Clear the screen and, if possible, the terminal's scrollback
     buffer, then redraw the current line, leaving the current line at
     the top of the screen.

‘clear-screen (C-l)’
     Clear the screen, then redraw the current line, leaving the current
     line at the top of the screen.  If given a numeric argument, this
     refreshes the current line without clearing the screen.

‘redraw-current-line ()’
     Refresh the current line.  By default, this is unbound.


File: readline.info,  Node: Commands For History,  Next: Commands For Text,  Prev: Commands For Moving,  Up: Bindable Readline Commands

1.4.2 Commands For Manipulating The History
-------------------------------------------

‘accept-line (Newline or Return)’
     Accept the line regardless of where the cursor is.  If this line is
     non-empty, you can add it to the history list using
     ‘add_history()’.  If this line is a modified history line, then
     restore the history line to its original state.

‘previous-history (C-p)’
     Move 'back' through the history list, fetching the previous
     command.  This may also be bound to the up arrow key on some
     keyboards.

‘next-history (C-n)’
     Move 'forward' through the history list, fetching the next command.
     This may also be bound to the down arrow key on some keyboards.

‘beginning-of-history (M-<)’
     Move to the first line in the history.

‘end-of-history (M->)’
     Move to the end of the input history, i.e., the line currently
     being entered.

‘reverse-search-history (C-r)’
     Search backward starting at the current line and moving 'up'
     through the history as necessary.  This is an incremental search.
     This command sets the region to the matched text and activates the
     region.

‘forward-search-history (C-s)’
     Search forward starting at the current line and moving 'down'
     through the history as necessary.  This is an incremental search.
     This command sets the region to the matched text and activates the
     region.

‘non-incremental-reverse-search-history (M-p)’
     Search backward starting at the current line and moving 'up'
     through the history as necessary using a non-incremental search for
     a string supplied by the user.  The search string may match
     anywhere in a history line.

‘non-incremental-forward-search-history (M-n)’
     Search forward starting at the current line and moving 'down'
     through the history as necessary using a non-incremental search for
     a string supplied by the user.  The search string may match
     anywhere in a history line.

‘history-search-backward ()’
     Search backward through the history for the string of characters
     between the start of the current line and the point.  The search
     string must match at the beginning of a history line.  This is a
     non-incremental search.  By default, this command is unbound, but
     may be bound to the Page Down key on some keyboards.

‘history-search-forward ()’
     Search forward through the history for the string of characters
     between the start of the current line and the point.  The search
     string must match at the beginning of a history line.  This is a
     non-incremental search.  By default, this command is unbound, but
     may be bound to the Page Up key on some keyboards.

‘history-substring-search-backward ()’
     Search backward through the history for the string of characters
     between the start of the current line and the point.  The search
     string may match anywhere in a history line.  This is a
     non-incremental search.  By default, this command is unbound.

‘history-substring-search-forward ()’
     Search forward through the history for the string of characters
     between the start of the current line and the point.  The search
     string may match anywhere in a history line.  This is a
     non-incremental search.  By default, this command is unbound.

‘yank-nth-arg (M-C-y)’
     Insert the first argument to the previous command (usually the
     second word on the previous line) at point.  With an argument N,
     insert the Nth word from the previous command (the words in the
     previous command begin with word 0).  A negative argument inserts
     the Nth word from the end of the previous command.  Once the
     argument N is computed, this uses the history expansion facilities
     to extract the Nth word, as if the ‘!N’ history expansion had been
     specified.

‘yank-last-arg (M-. or M-_)’
     Insert last argument to the previous command (the last word of the
     previous history entry).  With a numeric argument, behave exactly
     like ‘yank-nth-arg’.  Successive calls to ‘yank-last-arg’ move back
     through the history list, inserting the last word (or the word
     specified by the argument to the first call) of each line in turn.
     Any numeric argument supplied to these successive calls determines
     the direction to move through the history.  A negative argument
     switches the direction through the history (back or forward).  This
     uses the history expansion facilities to extract the last word, as
     if the ‘!$’ history expansion had been specified.

‘operate-and-get-next (C-o)’
     Accept the current line for return to the calling application as if
     a newline had been entered, and fetch the next line relative to the
     current line from the history for editing.  A numeric argument, if
     supplied, specifies the history entry to use instead of the current
     line.

‘fetch-history ()’
     With a numeric argument, fetch that entry from the history list and
     make it the current line.  Without an argument, move back to the
     first entry in the history list.


File: readline.info,  Node: Commands For Text,  Next: Commands For Killing,  Prev: Commands For History,  Up: Bindable Readline Commands

1.4.3 Commands For Changing Text
--------------------------------

‘end-of-file (usually C-d)’
     The character indicating end-of-file as set, for example, by
     ‘stty’.  If this character is read when there are no characters on
     the line, and point is at the beginning of the line, Readline
     interprets it as the end of input and returns EOF.

‘delete-char (C-d)’
     Delete the character at point.  If this function is bound to the
     same character as the tty EOF character, as ‘C-d’ commonly is, see
     above for the effects.  This may also be bound to the Delete key on
     some keyboards.

‘backward-delete-char (Rubout)’
     Delete the character behind the cursor.  A numeric argument means
     to kill the characters, saving them on the kill ring, instead of
     deleting them.

‘forward-backward-delete-char ()’
     Delete the character under the cursor, unless the cursor is at the
     end of the line, in which case the character behind the cursor is
     deleted.  By default, this is not bound to a key.

‘quoted-insert (C-q or C-v)’
     Add the next character typed to the line verbatim.  This is how to
     insert key sequences like ‘C-q’, for example.

‘tab-insert (M-<TAB>)’
     Insert a tab character.

‘self-insert (a, b, A, 1, !, ...)’
     Insert the character typed.

‘bracketed-paste-begin ()’
     This function is intended to be bound to the "bracketed paste"
     escape sequence sent by some terminals, and such a binding is
     assigned by default.  It allows Readline to insert the pasted text
     as a single unit without treating each character as if it had been
     read from the keyboard.  The characters are inserted as if each one
     was bound to ‘self-insert’ instead of executing any editing
     commands.

     Bracketed paste sets the region (the characters between point and
     the mark) to the inserted text.  It sets the _active region_.

‘transpose-chars (C-t)’
     Drag the character before the cursor forward over the character at
     the cursor, moving the cursor forward as well.  If the insertion
     point is at the end of the line, then this transposes the last two
     characters of the line.  Negative arguments have no effect.

‘transpose-words (M-t)’
     Drag the word before point past the word after point, moving point
     past that word as well.  If the insertion point is at the end of
     the line, this transposes the last two words on the line.

‘upcase-word (M-u)’
     Uppercase the current (or following) word.  With a negative
     argument, uppercase the previous word, but do not move the cursor.

‘downcase-word (M-l)’
     Lowercase the current (or following) word.  With a negative
     argument, lowercase the previous word, but do not move the cursor.

‘capitalize-word (M-c)’
     Capitalize the current (or following) word.  With a negative
     argument, capitalize the previous word, but do not move the cursor.

‘overwrite-mode ()’
     Toggle overwrite mode.  With an explicit positive numeric argument,
     switches to overwrite mode.  With an explicit non-positive numeric
     argument, switches to insert mode.  This command affects only
     ‘emacs’ mode; ‘vi’ mode does overwrite differently.  Each call to
     ‘readline()’ starts in insert mode.

     In overwrite mode, characters bound to ‘self-insert’ replace the
     text at point rather than pushing the text to the right.
     Characters bound to ‘backward-delete-char’ replace the character
     before point with a space.

     By default, this command is unbound, but may be bound to the Insert
     key on some keyboards.


File: readline.info,  Node: Commands For Killing,  Next: Numeric Arguments,  Prev: Commands For Text,  Up: Bindable Readline Commands

1.4.4 Killing And Yanking
-------------------------

‘kill-line (C-k)’
     Kill the text from point to the end of the current line.  With a
     negative numeric argument, kill backward from the cursor to the
     beginning of the line.

‘backward-kill-line (C-x Rubout)’
     Kill backward from the cursor to the beginning of the current line.
     With a negative numeric argument, kill forward from the cursor to
     the end of the line.

‘unix-line-discard (C-u)’
     Kill backward from the cursor to the beginning of the current line.

‘kill-whole-line ()’
     Kill all characters on the current line, no matter where point is.
     By default, this is unbound.

‘kill-word (M-d)’
     Kill from point to the end of the current word, or if between
     words, to the end of the next word.  Word boundaries are the same
     as ‘forward-word’.

‘backward-kill-word (M-<DEL>)’
     Kill the word behind point.  Word boundaries are the same as
     ‘backward-word’.

‘unix-word-rubout (C-w)’
     Kill the word behind point, using white space as a word boundary,
     saving the killed text on the kill-ring.

‘unix-filename-rubout ()’
     Kill the word behind point, using white space and the slash
     character as the word boundaries, saving the killed text on the
     kill-ring.

‘delete-horizontal-space ()’
     Delete all spaces and tabs around point.  By default, this is
     unbound.

‘kill-region ()’
     Kill the text in the current region.  By default, this command is
     unbound.

‘copy-region-as-kill ()’
     Copy the text in the region to the kill buffer, so it can be yanked
     right away.  By default, this command is unbound.

‘copy-backward-word ()’
     Copy the word before point to the kill buffer.  The word boundaries
     are the same as ‘backward-word’.  By default, this command is
     unbound.

‘copy-forward-word ()’
     Copy the word following point to the kill buffer.  The word
     boundaries are the same as ‘forward-word’.  By default, this
     command is unbound.

‘yank (C-y)’
     Yank the top of the kill ring into the buffer at point.

‘yank-pop (M-y)’
     Rotate the kill-ring, and yank the new top.  You can only do this
     if the prior command is ‘yank’ or ‘yank-pop’.


File: readline.info,  Node: Numeric Arguments,  Next: Commands For Completion,  Prev: Commands For Killing,  Up: Bindable Readline Commands

1.4.5 Specifying Numeric Arguments
----------------------------------

‘digit-argument (M-0, M-1, ... M--)’
     Add this digit to the argument already accumulating, or start a new
     argument.  ‘M--’ starts a negative argument.

‘universal-argument ()’
     This is another way to specify an argument.  If this command is
     followed by one or more digits, optionally with a leading minus
     sign, those digits define the argument.  If the command is followed
     by digits, executing ‘universal-argument’ again ends the numeric
     argument, but is otherwise ignored.  As a special case, if this
     command is immediately followed by a character that is neither a
     digit nor minus sign, the argument count for the next command is
     multiplied by four.  The argument count is initially one, so
     executing this function the first time makes the argument count
     four, a second time makes the argument count sixteen, and so on.
     By default, this is not bound to a key.


File: readline.info,  Node: Commands For Completion,  Next: Keyboard Macros,  Prev: Numeric Arguments,  Up: Bindable Readline Commands

1.4.6 Letting Readline Type For You
-----------------------------------

‘complete (<TAB>)’
     Attempt to perform completion on the text before point.  The actual
     completion performed is application-specific.  The default is
     filename completion.

‘possible-completions (M-?)’
     List the possible completions of the text before point.  When
     displaying completions, Readline sets the number of columns used
     for display to the value of ‘completion-display-width’, the value
     of the environment variable ‘COLUMNS’, or the screen width, in that
     order.

‘insert-completions (M-*)’
     Insert all completions of the text before point that would have
     been generated by ‘possible-completions’, separated by a space.

‘menu-complete ()’
     Similar to ‘complete’, but replaces the word to be completed with a
     single match from the list of possible completions.  Repeatedly
     executing ‘menu-complete’ steps through the list of possible
     completions, inserting each match in turn.  At the end of the list
     of completions, ‘menu-complete’ rings the bell (subject to the
     setting of ‘bell-style’) and restores the original text.  An
     argument of N moves N positions forward in the list of matches; a
     negative argument moves backward through the list.  This command is
     intended to be bound to <TAB>, but is unbound by default.

‘menu-complete-backward ()’
     Identical to ‘menu-complete’, but moves backward through the list
     of possible completions, as if ‘menu-complete’ had been given a
     negative argument.  This command is unbound by default.

‘export-completions ()’
     Perform completion on the word before point as described above and
     write the list of possible completions to Readline's output stream
     using the following format, writing information on separate lines:

        • the number of matches N;
        • the word being completed;
        • S:E, where S and E are the start and end offsets of the word
          in the Readline line buffer; then
        • each match, one per line

     If there are no matches, the first line will be "0", and this
     command does not print any output after the S:E.  If there is only
     a single match, this prints a single line containing it.  If there
     is more than one match, this prints the common prefix of the
     matches, which may be empty, on the first line after the S:E, then
     the matches on subsequent lines.  In this case, N will include the
     first line with the common prefix.

     The user or application should be able to accommodate the
     possibility of a blank line.  The intent is that the user or
     application reads N lines after the line containing S:E to obtain
     the match list.  This command is unbound by default.

‘delete-char-or-list ()’
     Deletes the character under the cursor if not at the beginning or
     end of the line (like ‘delete-char’).  At the end of the line, it
     behaves identically to ‘possible-completions’.  This command is
     unbound by default.


File: readline.info,  Node: Keyboard Macros,  Next: Miscellaneous Commands,  Prev: Commands For Completion,  Up: Bindable Readline Commands

1.4.7 Keyboard Macros
---------------------

‘start-kbd-macro (C-x ()’
     Begin saving the characters typed into the current keyboard macro.

‘end-kbd-macro (C-x ))’
     Stop saving the characters typed into the current keyboard macro
     and save the definition.

‘call-last-kbd-macro (C-x e)’
     Re-execute the last keyboard macro defined, by making the
     characters in the macro appear as if typed at the keyboard.

‘print-last-kbd-macro ()’
     Print the last keyboard macro defined in a format suitable for the
     INPUTRC file.


File: readline.info,  Node: Miscellaneous Commands,  Prev: Keyboard Macros,  Up: Bindable Readline Commands

1.4.8 Some Miscellaneous Commands
---------------------------------

‘re-read-init-file (C-x C-r)’
     Read in the contents of the INPUTRC file, and incorporate any
     bindings or variable assignments found there.

‘abort (C-g)’
     Abort the current editing command and ring the terminal's bell
     (subject to the setting of ‘bell-style’).

‘do-lowercase-version (M-A, M-B, M-X, ...)’
     If the metafied character X is upper case, run the command that is
     bound to the corresponding metafied lower case character.  The
     behavior is undefined if X is already lower case.

‘prefix-meta (<ESC>)’
     Metafy the next character typed.  Typing ‘<ESC> f’ is equivalent to
     typing ‘M-f’.

‘undo (C-_ or C-x C-u)’
     Incremental undo, separately remembered for each line.

‘revert-line (M-r)’
     Undo all changes made to this line.  This is like executing the
     ‘undo’ command enough times to get back to the initial state.

‘tilde-expand (M-~)’
     Perform tilde expansion on the current word.

‘set-mark (C-@)’
     Set the mark to the point.  If a numeric argument is supplied, set
     the mark to that position.

‘exchange-point-and-mark (C-x C-x)’
     Swap the point with the mark.  Set the current cursor position to
     the saved position, then set the mark to the old cursor position.

‘character-search (C-])’
     Read a character and move point to the next occurrence of that
     character.  A negative argument searches for previous occurrences.

‘character-search-backward (M-C-])’
     Read a character and move point to the previous occurrence of that
     character.  A negative argument searches for subsequent
     occurrences.

‘skip-csi-sequence ()’
     Read enough characters to consume a multi-key sequence such as
     those defined for keys like Home and End.  CSI sequences begin with
     a Control Sequence Indicator (CSI), usually ‘ESC [’.  If this
     sequence is bound to "\e[", keys producing CSI sequences have no
     effect unless explicitly bound to a Readline command, instead of
     inserting stray characters into the editing buffer.  This is
     unbound by default, but usually bound to ‘ESC [’.

‘insert-comment (M-#)’
     Without a numeric argument, insert the value of the ‘comment-begin’
     variable at the beginning of the current line.  If a numeric
     argument is supplied, this command acts as a toggle: if the
     characters at the beginning of the line do not match the value of
     ‘comment-begin’, insert the value; otherwise delete the characters
     in ‘comment-begin’ from the beginning of the line.  In either case,
     the line is accepted as if a newline had been typed.

‘dump-functions ()’
     Print all of the functions and their key bindings to the Readline
     output stream.  If a numeric argument is supplied, the output is
     formatted in such a way that it can be made part of an INPUTRC
     file.  This command is unbound by default.

‘dump-variables ()’
     Print all of the settable variables and their values to the
     Readline output stream.  If a numeric argument is supplied, the
     output is formatted in such a way that it can be made part of an
     INPUTRC file.  This command is unbound by default.

‘dump-macros ()’
     Print all of the Readline key sequences bound to macros and the
     strings they output to the Readline output stream.  If a numeric
     argument is supplied, the output is formatted in such a way that it
     can be made part of an INPUTRC file.  This command is unbound by
     default.

‘execute-named-command (M-x)’
     Read a bindable Readline command name from the input and execute
     the function to which it's bound, as if the key sequence to which
     it was bound appeared in the input.  If this function is supplied
     with a numeric argument, it passes that argument to the function it
     executes.

‘emacs-editing-mode (C-e)’
     When in ‘vi’ command mode, this causes a switch to ‘emacs’ editing
     mode.

‘vi-editing-mode (M-C-j)’
     When in ‘emacs’ editing mode, this causes a switch to ‘vi’ editing
     mode.


File: readline.info,  Node: Readline vi Mode,  Prev: Bindable Readline Commands,  Up: Command Line Editing

1.5 Readline vi Mode
====================

While the Readline library does not have a full set of ‘vi’ editing
functions, it does contain enough to allow simple editing of the line.
The Readline ‘vi’ mode behaves as specified in the ‘sh’ description in
the POSIX standard.

   In order to switch interactively between ‘emacs’ and ‘vi’ editing
modes, use the command ‘M-C-j’ (bound to emacs-editing-mode when in ‘vi’
mode and to vi-editing-mode in ‘emacs’ mode).  The Readline default is
‘emacs’ mode.

   When you enter a line in ‘vi’ mode, you are already placed in
'insertion' mode, as if you had typed an ‘i’.  Pressing <ESC> switches
you into 'command' mode, where you can edit the text of the line with
the standard ‘vi’ movement keys, move to previous history lines with ‘k’
and subsequent lines with ‘j’, and so forth.

   This document describes the GNU Readline Library, a utility for
aiding in the consistency of user interface across discrete programs
that need to provide a command line interface.

   Copyright (C) 1988-2025 Free Software Foundation, Inc.

   Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice pare
preserved on all copies.

   Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

   Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that this permission notice may be stated in a
translation approved by the Foundation.


File: readline.info,  Node: Programming with GNU Readline,  Next: GNU Free Documentation License,  Prev: Command Line Editing,  Up: Top

2 Programming with GNU Readline
*******************************

This chapter describes the interface between the GNU Readline Library
and other programs.  If you are a programmer, and you wish to include
the features found in GNU Readline such as completion, line editing, and
interactive history manipulation in your own programs, this section is
for you.

* Menu:

* Basic Behavior::	Using the default behavior of Readline.
* Custom Functions::	Adding your own functions to Readline.
* Readline Variables::			Variables accessible to custom
					functions.
* Readline Convenience Functions::	Functions which Readline supplies to
					aid in writing your own custom
					functions.
* Readline Signal Handling::	How Readline behaves when it receives signals.
* Custom Completers::	Supplanting or supplementing Readline's
			completion functions.


File: readline.info,  Node: Basic Behavior,  Next: Custom Functions,  Up: Programming with GNU Readline

2.1 Basic Behavior
==================

Many programs provide a command line interface, such as ‘mail’, ‘ftp’,
and ‘sh’.  For such programs, the default behavior of Readline is
sufficient.  This section describes how to use Readline in the simplest
way possible, perhaps to replace calls in your code to ‘fgets()’.

   The function ‘readline()’ prints a prompt PROMPT and then reads and
returns a single line of text from the user.  Since it's possible to
enter characters into the line while quoting them to disable any
Readline editing function they might normally have, this line may
include embedded newlines and other special characters.  If PROMPT is
‘NULL’ or the empty string, ‘readline()’ does not display a prompt.  The
line ‘readline()’ returns is allocated with ‘malloc()’; the caller
should ‘free()’ the line when it has finished with it.  The declaration
for ‘readline’ in ANSI C is

     char *readline (const char *PROMPT);

So, one might say
     char *line = readline ("Enter a line: ");
in order to read a line of text from the user.  The line returned has
the final newline removed, so only the text remains.  This means that
lines consisting of a newline return the empty string.

   If Readline encounters an ‘EOF’ while reading the line, and the line
is empty at that point, then ‘readline()’ returns ‘(char *)NULL’.
Otherwise, the line is ended just as if a newline had been typed.

   Readline performs some expansion on the PROMPT before it is displayed
on the screen.  See the description of ‘rl_expand_prompt’ (*note
Redisplay::) for additional details, especially if PROMPT will contain
characters that do not consume physical screen space when displayed.

   If you want the user to be able to get at the line later, (with <C-p>
for example), you must call ‘add_history()’ to save the line away in a
“history” list of such lines.

     add_history (line);

For full details on the GNU History Library, see the associated manual.

   It is preferable to avoid saving empty lines on the history list,
since users rarely have a burning need to reuse a blank line.  Here is a
function which usefully replaces the standard ‘gets()’ library function,
and has the advantage of no static buffer to overflow:

     /* A static variable for holding the line. */
     static char *line_read = (char *)NULL;

     /* Read a string, and return a pointer to it.
        Returns NULL on EOF. */
     char *
     rl_gets ()
     {
       /* If the buffer has already been allocated,
          return the memory to the free pool. */
       if (line_read)
         {
           free (line_read);
           line_read = (char *)NULL;
         }

       /* Get a line from the user. */
       line_read = readline ("");

       /* If the line has any text in it,
          save it on the history. */
       if (line_read && *line_read)
         add_history (line_read);

       return (line_read);
     }

   This function gives the user the default behavior of <TAB>
completion: filename completion.  If you do not want Readline to
complete filenames, you can change the binding of the <TAB> key with
‘rl_bind_key()’.

     int rl_bind_key (int KEY, rl_command_func_t *FUNCTION);

   ‘rl_bind_key()’ takes two arguments: KEY is the character that you
want to bind, and FUNCTION is the address of the function to call when
KEY is pressed.  Binding <TAB> to ‘rl_insert()’ makes <TAB> insert
itself.  ‘rl_bind_key()’ returns non-zero if KEY is not a valid ASCII
character code (between 0 and 255).

   Thus, to disable the default <TAB> behavior, the following suffices:
     rl_bind_key ('\t', rl_insert);

   This code should be executed once at the start of your program; you
might write a function called ‘initialize_readline()’ which performs
this and other desired initializations, such as installing custom
completers (*note Custom Completers::).


File: readline.info,  Node: Custom Functions,  Next: Readline Variables,  Prev: Basic Behavior,  Up: Programming with GNU Readline

2.2 Custom Functions
====================

Readline provides many functions for manipulating the text of the line,
but it isn't possible to anticipate the needs of all programs.  This
section describes the various functions and variables defined within the
Readline library which allow a program to add customized functionality
to Readline.

   Before declaring any functions that customize Readline's behavior, or
using any functionality Readline provides in other code, an application
writer should include the file ‘<readline/readline.h>’ in any file that
uses Readline's features.  Since some of the definitions in ‘readline.h’
use the ‘stdio’ library, the program should include the file ‘<stdio.h>’
before ‘readline.h’.

   ‘readline.h’ defines a C preprocessor variable that should be treated
as an integer, ‘RL_READLINE_VERSION’, which may be used to conditionally
compile application code depending on the installed Readline version.
The value is a hexadecimal encoding of the major and minor version
numbers of the library, of the form 0xMMMM.  MM is the two-digit major
version number; MM is the two-digit minor version number.  For Readline
4.2, for example, the value of ‘RL_READLINE_VERSION’ would be ‘0x0402’.

* Menu:

* Readline Typedefs::	C declarations to make code readable.
* Function Writing::	Variables and calling conventions.


File: readline.info,  Node: Readline Typedefs,  Next: Function Writing,  Up: Custom Functions

2.2.1 Readline Typedefs
-----------------------

For readability, we declare a number of new object types, all pointers
to functions.

   The reason for declaring these new types is to make it easier to
write code describing pointers to C functions with appropriately
prototyped arguments and return values.

   For instance, say we want to declare a variable FUNC as a pointer to
a function which takes two ‘int’ arguments and returns an ‘int’ (this is
the type of all of the Readline bindable functions).  Instead of the
classic C declaration

   ‘int (*func)();’

or the ANSI-C style declaration

   ‘int (*func)(int, int);’

we may write

   ‘rl_command_func_t *func;’

   The full list of function pointer types available is

‘typedef int rl_command_func_t (int, int);’

‘typedef char *rl_compentry_func_t (const char *, int);’

‘typedef char **rl_completion_func_t (const char *, int, int);’

‘typedef char *rl_quote_func_t (char *, int, char *);’

‘typedef char *rl_dequote_func_t (char *, int);’

‘typedef int rl_compignore_func_t (char **);’

‘typedef void rl_compdisp_func_t (char **, int, int);’

‘typedef void rl_macro_print_func_t (const char *, const char *, int, const char *);’

‘typedef int rl_hook_func_t (void);’

‘typedef int rl_getc_func_t (FILE *);’

‘typedef int rl_linebuf_func_t (char *, int);’

‘typedef int rl_intfunc_t (int);’
‘#define rl_ivoidfunc_t rl_hook_func_t’
‘typedef int rl_icpfunc_t (char *);’
‘typedef int rl_icppfunc_t (char **);’

‘typedef void rl_voidfunc_t (void);’
‘typedef void rl_vintfunc_t (int);’
‘typedef void rl_vcpfunc_t (char *);’
‘typedef void rl_vcppfunc_t (char **);’

The ‘rltypedefs.h’ file has more documentation for these types.


File: readline.info,  Node: Function Writing,  Prev: Readline Typedefs,  Up: Custom Functions

2.2.2 Writing a New Function
----------------------------

In order to write new functions for Readline, you need to know the
calling conventions for keyboard-invoked functions, and the names of the
variables that describe the current state of the line read so far.

   The calling sequence for a command ‘foo’ looks like

     int foo (int count, int key)

where COUNT is the numeric argument (or 1 if defaulted) and KEY is the
key that invoked this function.

   It is completely up to the function as to what should be done with
the numeric argument.  Some functions use it as a repeat count, some as
a flag, and others to choose alternate behavior (refreshing the current
line as opposed to refreshing the screen, for example).  Some choose to
ignore it.  In general, if a function uses the numeric argument as a
repeat count, it should be able to do something useful with both
negative and positive arguments.  At the very least, it should be aware
that it can be passed a negative argument.

   A command function should return 0 if its action completes
successfully, and a value greater than zero if some error occurs.  All
of the builtin Readline bindable command functions obey this convention.


File: readline.info,  Node: Readline Variables,  Next: Readline Convenience Functions,  Prev: Custom Functions,  Up: Programming with GNU Readline

2.3 Readline Variables
======================

These variables are available to function writers.

 -- Variable: char * rl_line_buffer
     This is the line gathered so far.  You are welcome to modify the
     contents of the line, but see *note Allowing Undoing::.  The
     function ‘rl_extend_line_buffer’ will increase the memory allocated
     to ‘rl_line_buffer’.

 -- Variable: int rl_point
     The offset of the current cursor position in ‘rl_line_buffer’ (the
     _point_).

 -- Variable: int rl_end
     The number of characters present in ‘rl_line_buffer’.  When
     ‘rl_point’ is at the end of the line, ‘rl_point’ and ‘rl_end’ are
     equal.

 -- Variable: int rl_mark
     The MARK (saved position) in the current line.  If set, the mark
     and point define a _region_.  Some Readline commands set the mark
     as part of operating; users can also set the mark explicitly.

 -- Variable: int rl_done
     Setting this to a non-zero value causes Readline to return the
     current line immediately.  Readline will set this variable when it
     has read a key sequence bound to ‘accept-line’ and is about to
     return the line to the caller.

 -- Variable: int rl_eof_found
     Readline will set this variable when it has read an EOF character
     (e.g., the stty ‘EOF’ character) on an empty line or has
     encountered a read error or EOF and is about to return a NULL line
     to the caller.

 -- Variable: int rl_num_chars_to_read
     Setting this to a positive value before calling ‘readline()’ causes
     Readline to return after accepting that many characters, rather
     than reading up to a character bound to ‘accept-line’.

 -- Variable: int rl_pending_input
     Setting this to a value makes it the next keystroke read.  This is
     a way to stuff a single character into the input stream.

 -- Variable: int rl_dispatching
     Set to a non-zero value if a function is being called from a key
     binding; zero otherwise.  Application functions can test this to
     discover whether they were called directly or by Readline's
     dispatching mechanism.

 -- Variable: int rl_erase_empty_line
     Setting this to a non-zero value causes Readline to completely
     erase the current line, including any prompt, any time a newline is
     typed as the only character on an otherwise-empty line.  This moves
     the cursor to the beginning of the newly-blank line.

 -- Variable: char * rl_prompt
     The prompt Readline uses.  This is set from the argument to
     ‘readline()’, and should not be assigned to directly.  The
     ‘rl_set_prompt()’ function (*note Redisplay::) may be used to
     modify the prompt string after calling ‘readline()’.  Readline
     performs some prompt expansions and analyzes the prompt for line
     breaks, so ‘rl_set_prompt()’ is preferred.

 -- Variable: char * rl_display_prompt
     The string displayed as the prompt.  This is usually identical to
     RL_PROMPT, but may be changed temporarily by functions that use the
     prompt string as a message area, such as incremental search.

 -- Variable: int rl_already_prompted
     If an application wishes to display the prompt itself, rather than
     have Readline do it the first time ‘readline()’ is called, it
     should set this variable to a non-zero value after displaying the
     prompt.  The prompt must also be passed as the argument to
     ‘readline()’ so the redisplay functions can update the display
     properly.  The calling application is responsible for managing the
     value; Readline never sets it.

 -- Variable: const char * rl_library_version
     The version number of this revision of the Readline library, as a
     string (e.g., "4.2").

 -- Variable: int rl_readline_version
     An integer encoding the current version of the library.  The
     encoding is of the form 0xMMMM, where MM is the two-digit major
     version number, and MM is the two-digit minor version number.  For
     example, for Readline-4.2, ‘rl_readline_version’ would have the
     value 0x0402.

 -- Variable: int rl_gnu_readline_p
     Always set to 1, denoting that this is GNU Readline rather than
     some emulation.

 -- Variable: const char * rl_terminal_name
     The terminal type, used for initialization.  If not set by the
     application, Readline sets this to the value of the ‘TERM’
     environment variable the first time it is called.  Readline uses
     this to look up the terminal capabilities it needs in the terminfo
     database.

 -- Variable: const char * rl_readline_name
     This variable is set to a unique name by each application using
     Readline.  The value allows conditional parsing of the inputrc file
     (*note Conditional Init Constructs::).

 -- Variable: FILE * rl_instream
     The stdio stream from which Readline reads input.  If ‘NULL’,
     Readline defaults to STDIN.

 -- Variable: FILE * rl_outstream
     The stdio stream to which Readline performs output.  If ‘NULL’,
     Readline defaults to STDOUT.

 -- Variable: int rl_prefer_env_winsize
     If non-zero, Readline gives values found in the ‘LINES’ and
     ‘COLUMNS’ environment variables greater precedence than values
     fetched from the kernel when computing the screen dimensions.

 -- Variable: rl_command_func_t * rl_last_func
     The address of the last command function Readline executed.  This
     may be used to test whether or not a function is being executed
     twice in succession, for example.

 -- Variable: rl_hook_func_t * rl_startup_hook
     If non-zero, this is the address of a function to call just before
     Readline prints the first prompt.

 -- Variable: rl_hook_func_t * rl_pre_input_hook
     If non-zero, this is the address of a function to call after the
     first prompt has been printed and just before Readline starts
     reading input characters.

 -- Variable: rl_hook_func_t * rl_event_hook
     If non-zero, this is the address of a function to call periodically
     when Readline is waiting for terminal input.  By default, this will
     be called at most ten times a second if there is no keyboard input.

 -- Variable: rl_getc_func_t * rl_getc_function
     If non-zero, Readline will call indirectly through this pointer to
     get a character from the input stream.  By default, it is set to
     ‘rl_getc’, the Readline character input function (*note Character
     Input::).  In general, an application that sets RL_GETC_FUNCTION
     should consider setting RL_INPUT_AVAILABLE_HOOK as well.

 -- Variable: rl_hook_func_t * rl_signal_event_hook
     If non-zero, this is the address of a function to call if a read
     system call is interrupted by a signal when Readline is reading
     terminal input.

 -- Variable: rl_hook_func_t * rl_timeout_event_hook
     If non-zero, this is the address of a function to call if Readline
     times out while reading input.

 -- Variable: rl_hook_func_t * rl_input_available_hook
     If non-zero, Readline will use this function's return value when it
     needs to determine whether or not there is available input on the
     current input source.  The default hook checks ‘rl_instream’; if an
     application is using a different input source, it should set the
     hook appropriately.  Readline queries for available input when
     implementing intra-key-sequence timeouts during input and
     incremental searches.  This function must return zero if there is
     no input available, and non-zero if input is available.  This may
     use an application-specific timeout before returning a value;
     Readline uses the value passed to ‘rl_set_keyboard_input_timeout()’
     or the value of the user-settable KEYSEQ-TIMEOUT variable.  This is
     designed for use by applications using Readline's callback
     interface (*note Alternate Interface::), which may not use the
     traditional ‘read(2)’ and file descriptor interface, or other
     applications using a different input mechanism.  If an application
     uses an input mechanism or hook that can potentially exceed the
     value of KEYSEQ-TIMEOUT, it should increase the timeout or set this
     hook appropriately even when not using the callback interface.  In
     general, an application that sets RL_GETC_FUNCTION should consider
     setting RL_INPUT_AVAILABLE_HOOK as well.

 -- Variable: rl_voidfunc_t * rl_redisplay_function
     Readline will call indirectly through this pointer to update the
     display with the current contents of the editing buffer.  By
     default, it is set to ‘rl_redisplay’, the default Readline
     redisplay function (*note Redisplay::).

 -- Variable: rl_vintfunc_t * rl_prep_term_function
     If non-zero, Readline will call indirectly through this pointer to
     initialize the terminal.  The function takes a single argument, an
     ‘int’ flag that says whether or not to use eight-bit characters.
     By default, this is set to ‘rl_prep_terminal’ (*note Terminal
     Management::).

 -- Variable: rl_voidfunc_t * rl_deprep_term_function
     If non-zero, Readline will call indirectly through this pointer to
     reset the terminal.  This function should undo the effects of
     ‘rl_prep_term_function’.  By default, this is set to
     ‘rl_deprep_terminal’ (*note Terminal Management::).

 -- Variable: void rl_macro_display_hook
     If set, this points to a function that ‘rl_macro_dumper’ will call
     to display a key sequence bound to a macro.  It is called with the
     key sequence, the "untranslated" macro value (i.e., with backslash
     escapes included, as when passed to ‘rl_macro_bind’), the
     ‘readable’ argument passed to ‘rl_macro_dumper’, and any prefix to
     display before the key sequence.

 -- Variable: Keymap rl_executing_keymap
     This variable is set to the keymap (*note Keymaps::) in which the
     currently executing Readline function was found.

 -- Variable: Keymap rl_binding_keymap
     This variable is set to the keymap (*note Keymaps::) in which the
     last key binding occurred.

 -- Variable: char * rl_executing_macro
     This variable is set to the text of any currently-executing macro.

 -- Variable: int rl_executing_key
     The key that caused the dispatch to the currently-executing
     Readline function.

 -- Variable: char * rl_executing_keyseq
     The full key sequence that caused the dispatch to the
     currently-executing Readline function.

 -- Variable: int rl_key_sequence_length
     The number of characters in RL_EXECUTING_KEYSEQ.

 -- Variable: int rl_readline_state
     A variable with bit values that encapsulate the current Readline
     state.  A bit is set with the ‘RL_SETSTATE’ macro, and unset with
     the ‘RL_UNSETSTATE’ macro.  Use the ‘RL_ISSTATE’ macro to test
     whether a particular state bit is set.  Current state bits include:

     ‘RL_STATE_NONE’
          Readline has not yet been called, nor has it begun to
          initialize.
     ‘RL_STATE_INITIALIZING’
          Readline is initializing its internal data structures.
     ‘RL_STATE_INITIALIZED’
          Readline has completed its initialization.
     ‘RL_STATE_TERMPREPPED’
          Readline has modified the terminal modes to do its own input
          and redisplay.
     ‘RL_STATE_READCMD’
          Readline is reading a command from the keyboard.
     ‘RL_STATE_METANEXT’
          Readline is reading more input after reading the meta-prefix
          character.
     ‘RL_STATE_DISPATCHING’
          Readline is dispatching to a command.
     ‘RL_STATE_MOREINPUT’
          Readline is reading more input while executing an editing
          command.
     ‘RL_STATE_ISEARCH’
          Readline is performing an incremental history search.
     ‘RL_STATE_NSEARCH’
          Readline is performing a non-incremental history search.
     ‘RL_STATE_SEARCH’
          Readline is searching backward or forward through the history
          for a string.
     ‘RL_STATE_NUMERICARG’
          Readline is reading a numeric argument.
     ‘RL_STATE_MACROINPUT’
          Readline is currently getting its input from a
          previously-defined keyboard macro.
     ‘RL_STATE_MACRODEF’
          Readline is currently reading characters defining a keyboard
          macro.
     ‘RL_STATE_OVERWRITE’
          Readline is in overwrite mode.
     ‘RL_STATE_COMPLETING’
          Readline is performing word completion.
     ‘RL_STATE_SIGHANDLER’
          Readline is currently executing the Readline signal handler.
     ‘RL_STATE_UNDOING’
          Readline is performing an undo.
     ‘RL_STATE_INPUTPENDING’
          Readline has input pending due to a call to
          ‘rl_execute_next()’.
     ‘RL_STATE_TTYCSAVED’
          Readline has saved the values of the terminal's special
          characters.
     ‘RL_STATE_CALLBACK’
          Readline is currently using the alternate (callback) interface
          (*note Alternate Interface::).
     ‘RL_STATE_VIMOTION’
          Readline is reading the argument to a vi-mode "motion"
          command.
     ‘RL_STATE_MULTIKEY’
          Readline is reading a multiple-keystroke command.
     ‘RL_STATE_VICMDONCE’
          Readline has entered vi command (movement) mode at least one
          time during the current call to ‘readline()’.
     ‘RL_STATE_DONE’
          Readline has read a key sequence bound to ‘accept-line’ and is
          about to return the line to the caller.
     ‘RL_STATE_TIMEOUT’
          Readline has timed out (it did not receive a line or specified
          number of characters before the timeout duration specified by
          ‘rl_set_timeout’ elapsed) and is returning that status to the
          caller.
     ‘RL_STATE_EOF’
          Readline has read an EOF character (e.g., the stty ‘EOF’
          character) or encountered a read error or EOF and is about to
          return a NULL line to the caller.

 -- Variable: int rl_explicit_arg
     Set to a non-zero value if an explicit numeric argument was
     specified by the user.  It is only valid in a bindable command
     function.

 -- Variable: int rl_numeric_arg
     Set to the value of any numeric argument explicitly specified by
     the user before executing the current Readline function.  It is
     only valid in a bindable command function.

 -- Variable: int rl_editing_mode
     Set to a value denoting Readline's current editing mode.  A value
     of 1 means Readline is currently in emacs mode; 0 means that vi
     mode is active.  This determines the current keymap and key
     bindings.


File: readline.info,  Node: Readline Convenience Functions,  Next: Readline Signal Handling,  Prev: Readline Variables,  Up: Programming with GNU Readline

2.4 Readline Convenience Functions
==================================

* Menu:

* Function Naming::	How to give a function you write a name.
* Keymaps::		Making keymaps.
* Binding Keys::	Changing Keymaps.
* Associating Function Names and Bindings::	Translate function names to
						key sequences.
* Allowing Undoing::	How to make your functions undoable.
* Redisplay::		Functions to control line display.
* Modifying Text::	Functions to modify ‘rl_line_buffer’.
* Character Input::	Functions to read keyboard input.
* Terminal Management::	Functions to manage terminal settings.
* Utility Functions::	Generally useful functions and hooks.
* Miscellaneous Functions::	Functions that don't fall into any category.
* Alternate Interface::	Using Readline in a 'callback' fashion.
* A Readline Example::		An example Readline function.
* Alternate Interface Example::	An example program using the alternate interface.


File: readline.info,  Node: Function Naming,  Next: Keymaps,  Up: Readline Convenience Functions

2.4.1 Naming a Function
-----------------------

Readline has a descriptive string name for every function a user can
bind to a key sequence, so users can dynamically change the bindings
associated with key sequences while using Readline, using the
descriptive name when referring to the function.  Thus, in an init file,
one might find

     Meta-Rubout:	backward-kill-word

   This binds the keystroke <Meta-Rubout> to the function
_descriptively_ named ‘backward-kill-word’.  As the programmer, you
should bind the functions you write to descriptive names as well.
Readline provides a function for doing that:

 -- Function: int rl_add_defun (const char *name, rl_command_func_t
          *function, int key)
     Add NAME to the list of named functions.  Make FUNCTION be the
     function that gets called by key sequences that bind to NAME.  If
     KEY is not -1, then bind it to FUNCTION using ‘rl_bind_key()’.

   Using this function alone is sufficient for most applications.  It is
the recommended way to add a few functions to the default functions that
Readline has built in.  If you need to do something other than adding a
function to Readline, you may need to use the underlying functions
described below.


File: readline.info,  Node: Keymaps,  Next: Binding Keys,  Prev: Function Naming,  Up: Readline Convenience Functions

2.4.2 Selecting a Keymap
------------------------

Key bindings take place on a “keymap”.  The keymap is the association
between the keys that the user types and the functions that get run.
You can make your own keymaps, copy existing keymaps, and tell Readline
which keymap to use.

 -- Function: Keymap rl_make_bare_keymap (void)
     Returns a new, empty keymap.  The space for the keymap is allocated
     with ‘malloc()’; the caller should free it by calling
     ‘rl_free_keymap()’ when done.

 -- Function: Keymap rl_copy_keymap (Keymap map)
     Return a new keymap which is a copy of MAP.

 -- Function: Keymap rl_make_keymap (void)
     Return a new keymap with the printing characters bound to
     rl_insert, the lowercase Meta characters bound to run their
     equivalents, and the Meta digits bound to produce numeric
     arguments.

 -- Function: void rl_discard_keymap (Keymap keymap)
     Free the storage associated with the data in KEYMAP.  The caller
     should free KEYMAP.

 -- Function: void rl_free_keymap (Keymap keymap)
     Free all storage associated with KEYMAP.  This calls
     ‘rl_discard_keymap’ to free subordinate keymaps and macros.

 -- Function: int rl_empty_keymap (Keymap keymap)
     Return non-zero if there are no keys bound to functions in KEYMAP;
     zero if there are any keys bound.

   Readline has several internal keymaps.  These functions allow you to
change which keymap is active.  This is one way to switch editing modes,
for example.

 -- Function: Keymap rl_get_keymap (void)
     Returns the currently active keymap.

 -- Function: void rl_set_keymap (Keymap keymap)
     Makes KEYMAP the currently active keymap.

 -- Function: Keymap rl_get_keymap_by_name (const char *name)
     Return the keymap matching NAME.  NAME is one which would be
     supplied in a ‘set keymap’ inputrc line (*note Readline Init
     File::).

 -- Function: char * rl_get_keymap_name (Keymap keymap)
     Return the name matching KEYMAP.  NAME is one which would be
     supplied in a ‘set keymap’ inputrc line (*note Readline Init
     File::).

 -- Function: int rl_set_keymap_name (const char *name, Keymap keymap)
     Set the name of KEYMAP.  This name will then be "registered" and
     available for use in a ‘set keymap’ inputrc directive *note
     Readline Init File::).  The NAME may not be one of Readline's
     builtin keymap names; you may not add a different name for one of
     Readline's builtin keymaps.  You may replace the name associated
     with a given keymap by calling this function more than once with
     the same KEYMAP argument.  You may associate a registered NAME with
     a new keymap by calling this function more than once with the same
     NAME argument.  There is no way to remove a named keymap once the
     name has been registered.  Readline will make a copy of NAME.  The
     return value is greater than zero unless NAME is one of Readline's
     builtin keymap names or KEYMAP is one of Readline's builtin
     keymaps.


File: readline.info,  Node: Binding Keys,  Next: Associating Function Names and Bindings,  Prev: Keymaps,  Up: Readline Convenience Functions

2.4.3 Binding Keys
------------------

Key sequences are associated with functions through the keymap.
Readline has several internal keymaps: ‘emacs_standard_keymap’,
‘emacs_meta_keymap’, ‘emacs_ctlx_keymap’, ‘vi_movement_keymap’, and
‘vi_insertion_keymap’.  ‘emacs_standard_keymap’ is the default, and the
examples in this manual assume that.

   Since ‘readline()’ installs a set of default key bindings the first
time it is called, there is always the danger that a custom binding
installed before the first call to ‘readline()’ will be overridden.  An
alternate mechanism that can avoid this is to install custom key
bindings in an initialization function assigned to the ‘rl_startup_hook’
variable (*note Readline Variables::).

   These functions manage key bindings.

 -- Function: int rl_bind_key (int key, rl_command_func_t *function)
     Binds KEY to FUNCTION in the currently active keymap.  Returns
     non-zero in the case of an invalid KEY.

 -- Function: int rl_bind_key_in_map (int key, rl_command_func_t
          *function, Keymap map)
     Bind KEY to FUNCTION in MAP.  Returns non-zero in the case of an
     invalid KEY.

 -- Function: int rl_bind_key_if_unbound (int key, rl_command_func_t
          *function)
     Binds KEY to FUNCTION if it is not already bound in the currently
     active keymap.  Returns non-zero in the case of an invalid KEY or
     if KEY is already bound.

 -- Function: int rl_bind_key_if_unbound_in_map (int key,
          rl_command_func_t *function, Keymap map)
     Binds KEY to FUNCTION if it is not already bound in MAP.  Returns
     non-zero in the case of an invalid KEY or if KEY is already bound.

 -- Function: int rl_unbind_key (int key)
     Bind KEY to the null function in the currently active keymap.  This
     is not the same as binding it to ‘self-insert’.  Returns non-zero
     in case of error.

 -- Function: int rl_unbind_key_in_map (int key, Keymap map)
     Bind KEY to the null function in MAP.  This is not the same as
     binding it to ‘self-insert’.  Returns non-zero in case of error.

 -- Function: int rl_unbind_function_in_map (rl_command_func_t
          *function, Keymap map)
     Unbind all keys that execute FUNCTION in MAP.

 -- Function: int rl_unbind_command_in_map (const char *command, Keymap
          map)
     Unbind all keys that are bound to COMMAND in MAP.

 -- Function: int rl_bind_keyseq (const char *keyseq, rl_command_func_t
          *function)
     Bind the key sequence represented by the string KEYSEQ to the
     function FUNCTION, beginning in the current keymap.  This makes new
     keymaps as necessary.  The return value is non-zero if KEYSEQ is
     invalid.

 -- Function: int rl_bind_keyseq_in_map (const char *keyseq,
          rl_command_func_t *function, Keymap map)
     Bind the key sequence represented by the string KEYSEQ to the
     function FUNCTION in MAP.  This makes new keymaps as necessary.
     Initial bindings are performed in MAP.  The return value is
     non-zero if KEYSEQ is invalid.

 -- Function: int rl_set_key (const char *keyseq, rl_command_func_t
          *function, Keymap map)
     Equivalent to ‘rl_bind_keyseq_in_map’.

 -- Function: int rl_bind_keyseq_if_unbound (const char *keyseq,
          rl_command_func_t *function)
     Binds KEYSEQ to FUNCTION if it is not already bound in the
     currently active keymap.  Returns non-zero in the case of an
     invalid KEYSEQ or if KEYSEQ is already bound.

 -- Function: int rl_bind_keyseq_if_unbound_in_map (const char *keyseq,
          rl_command_func_t *function, Keymap map)
     Binds KEYSEQ to FUNCTION if it is not already bound in MAP.
     Returns non-zero in the case of an invalid KEYSEQ or if KEYSEQ is
     already bound.

 -- Function: int rl_generic_bind (int type, const char *keyseq, char
          *data, Keymap map)
     Bind the key sequence represented by the string KEYSEQ to the
     arbitrary pointer DATA.  TYPE says what kind of data is pointed to
     by DATA; this can be a function (‘ISFUNC’), a macro (‘ISMACR’), or
     a keymap (‘ISKMAP’).  This makes new keymaps as necessary.  The
     initial keymap in which to do bindings is MAP.  Returns non-zero in
     the case of an invalid KEYSEQ, zero otherwise.

 -- Function: int rl_parse_and_bind (char *line)
     Parse LINE as if it had been read from the ‘inputrc’ file and
     perform any key bindings and variable assignments found (*note
     Readline Init File::).

 -- Function: int rl_read_init_file (const char *filename)
     Read keybindings and variable assignments from FILENAME (*note
     Readline Init File::).


File: readline.info,  Node: Associating Function Names and Bindings,  Next: Allowing Undoing,  Prev: Binding Keys,  Up: Readline Convenience Functions

2.4.4 Associating Function Names and Bindings
---------------------------------------------

These functions allow you to find out what keys invoke named functions
and the functions invoked by a particular key sequence.  You may also
associate a new function name with an arbitrary function.

 -- Function: rl_command_func_t * rl_named_function (const char *name)
     Return the function with name NAME.  NAME is a descriptive name
     users might use in a key binding.

 -- Function: rl_command_func_t * rl_function_of_keyseq (const char
          *keyseq, Keymap map, int *type)
     Return the function invoked by KEYSEQ in keymap MAP.  If MAP is
     ‘NULL’, this uses the current keymap.  If TYPE is not ‘NULL’, this
     returns the type of the object in the ‘int’ variable it points to
     (one of ‘ISFUNC’, ‘ISKMAP’, or ‘ISMACR’).  It takes a "translated"
     key sequence and should not be used if the key sequence can include
     NUL.

 -- Function: rl_command_func_t * rl_function_of_keyseq_len (const char
          *keyseq, size_t len, Keymap map, int *type)
     Return the function invoked by KEYSEQ of length LEN in keymap MAP.
     Equivalent to ‘rl_function_of_keyseq’ with the addition of the LEN
     parameter.  It takes a "translated" key sequence and should be used
     if the key sequence can include NUL.

 -- Function: int rl_trim_arg_from_keyseq (const char *keyseq, size_t
          len, Keymap map)
     If there is a numeric argument at the beginning of KEYSEQ, possibly
     including digits, return the index of the first character in KEYSEQ
     following the numeric argument.  This can be used to skip over the
     numeric argument (which is available as ‘rl_numeric_arg’) while
     traversing the key sequence that invoked the current command.

 -- Function: char ** rl_invoking_keyseqs (rl_command_func_t *function)
     Return an array of strings representing the key sequences used to
     invoke FUNCTION in the current keymap.

 -- Function: char ** rl_invoking_keyseqs_in_map (rl_command_func_t
          *function, Keymap map)
     Return an array of strings representing the key sequences used to
     invoke FUNCTION in the keymap MAP.

 -- Function: void rl_print_keybinding (const char *name, Keymap map,
          int readable)
     Print key sequences bound to Readline function name NAME in keymap
     MAP.  If MAP is NULL, this uses the current keymap.  If READABLE is
     non-zero, the list is formatted in such a way that it can be made
     part of an ‘inputrc’ file and re-read to recreate the key binding.

 -- Function: void rl_function_dumper (int readable)
     Print the Readline function names and the key sequences currently
     bound to them to ‘rl_outstream’.  If READABLE is non-zero, the list
     is formatted in such a way that it can be made part of an ‘inputrc’
     file and re-read.

 -- Function: void rl_list_funmap_names (void)
     Print the names of all bindable Readline functions to
     ‘rl_outstream’.

 -- Function: const char ** rl_funmap_names (void)
     Return a NULL terminated array of known function names.  The array
     is sorted.  The array itself is allocated, but not the strings
     inside.  You should free the array, but not the pointers, using
     ‘free’ or ‘rl_free’ when you are done.

 -- Function: int rl_add_funmap_entry (const char *name,
          rl_command_func_t *function)
     Add NAME to the list of bindable Readline command names, and make
     FUNCTION the function to be called when NAME is invoked.  This
     returns the index of the newly-added NAME in the array of function
     names.


File: readline.info,  Node: Allowing Undoing,  Next: Redisplay,  Prev: Associating Function Names and Bindings,  Up: Readline Convenience Functions

2.4.5 Allowing Undoing
----------------------

Supporting the undo command is a painless thing, and makes your
functions much more useful.  It is certainly easier to try something if
you know you can undo it.

   If your function simply inserts text once, or deletes text once, and
uses ‘rl_insert_text()’ or ‘rl_delete_text()’ to do it, then Readline
does the undoing for you automatically.

   If you do multiple insertions or multiple deletions, or any
combination of these operations, you should group them together into one
operation.  This is done with ‘rl_begin_undo_group()’ and
‘rl_end_undo_group()’.

   The types of events Readline can undo are:

     enum undo_code { UNDO_DELETE, UNDO_INSERT, UNDO_BEGIN, UNDO_END };

   Notice that ‘UNDO_DELETE’ means to insert some text, and
‘UNDO_INSERT’ means to delete some text.  That is, the undo code tells
what to undo, not how to undo it.  ‘UNDO_BEGIN’ and ‘UNDO_END’ are tags
added by ‘rl_begin_undo_group()’ and ‘rl_end_undo_group()’; they are how
Readline delimits groups of commands that should be undone together.

 -- Function: int rl_begin_undo_group (void)
     Begins saving undo information in a group construct.  The undo
     information usually comes from calls to ‘rl_insert_text()’ and
     ‘rl_delete_text()’, but could be the result of calls to
     ‘rl_add_undo()’.

 -- Function: int rl_end_undo_group (void)
     Closes the current undo group started with ‘rl_begin_undo_group()’.
     There should be one call to ‘rl_end_undo_group()’ for each call to
     ‘rl_begin_undo_group()’.

 -- Function: void rl_add_undo (enum undo_code what, int start, int end,
          char *text)
     Remember how to undo an event (according to WHAT).  The affected
     text runs from START to END, and encompasses TEXT.

 -- Function: void rl_free_undo_list (void)
     Free the existing undo list.

 -- Function: int rl_do_undo (void)
     Undo the first thing on the undo list.  Returns ‘0’ if there was
     nothing to undo, non-zero if something was undone.

   Finally, if you neither insert nor delete text, but directly modify
the existing text (e.g., change its case), call ‘rl_modifying()’ once,
just before you modify the text.  You must supply the indices of the
text range that you are going to modify.  Readline will create an undo
group for you.

 -- Function: int rl_modifying (int start, int end)
     Tell Readline to save the text between START and END as a single
     undo unit.  It is assumed that you will subsequently modify that
     text.


File: readline.info,  Node: Redisplay,  Next: Modifying Text,  Prev: Allowing Undoing,  Up: Readline Convenience Functions

2.4.6 Redisplay
---------------

 -- Function: void rl_redisplay (void)
     Change what's displayed on the screen to reflect the current
     contents of ‘rl_line_buffer’.

 -- Function: int rl_forced_update_display (void)
     Force the line to be updated and redisplayed, whether or not
     Readline thinks the screen display is correct.

 -- Function: int rl_on_new_line (void)
     Tell the update functions that we have moved onto a new (empty)
     line, usually after outputting a newline.

 -- Function: int rl_on_new_line_with_prompt (void)
     Tell the update functions that we have moved onto a new line, with
     RL_PROMPT already displayed.  This could be used by applications
     that want to output the prompt string themselves, but still need
     Readline to know the prompt string length for redisplay.  It should
     be used after setting RL_ALREADY_PROMPTED.

 -- Function: int rl_clear_visible_line (void)
     Clear the screen lines corresponding to the current line's
     contents.

 -- Function: int rl_reset_line_state (void)
     Reset the display state to a clean state and redisplay the current
     line starting on a new line.

 -- Function: int rl_crlf (void)
     Move the cursor to the start of the next screen line.

 -- Function: int rl_show_char (int c)
     Display character C on ‘rl_outstream’.  If Readline has not been
     set to display meta characters directly, this will convert meta
     characters to a meta-prefixed key sequence.  This is intended for
     use by applications which wish to do their own redisplay.

 -- Function: int rl_message (const char *, ...)
     The arguments are a format string as would be supplied to ‘printf’,
     possibly containing conversion specifications such as ‘%d’, and any
     additional arguments necessary to satisfy the conversion
     specifications.  The resulting string is displayed in the “echo
     area”.  The echo area is also used to display numeric arguments and
     search strings.  You should call ‘rl_save_prompt’ to save the
     prompt information before calling this function.

 -- Function: int rl_clear_message (void)
     Clear the message in the echo area.  If the prompt was saved with a
     call to ‘rl_save_prompt’ before the last call to ‘rl_message’, you
     must call ‘rl_restore_prompt’ before calling this function.

 -- Function: void rl_save_prompt (void)
     Save the local Readline prompt display state in preparation for
     displaying a new message in the message area with ‘rl_message()’.

 -- Function: void rl_restore_prompt (void)
     Restore the local Readline prompt display state saved by the most
     recent call to ‘rl_save_prompt’.  If you called ‘rl_save_prompt’ to
     save the prompt before a call to ‘rl_message’, you should call this
     function before the corresponding call to ‘rl_clear_message’.

 -- Function: int rl_expand_prompt (char *prompt)
     Expand any special character sequences in PROMPT and set up the
     local Readline prompt redisplay variables.  This function is called
     by ‘readline()’.  It may also be called to expand the primary
     prompt if the application uses the ‘rl_on_new_line_with_prompt()’
     function or ‘rl_already_prompted’ variable.  It returns the number
     of visible characters on the last line of the (possibly multi-line)
     prompt.  Applications may indicate that the prompt contains
     characters that take up no physical screen space when displayed by
     bracketing a sequence of such characters with the special markers
     ‘RL_PROMPT_START_IGNORE’ and ‘RL_PROMPT_END_IGNORE’ (declared in
     ‘readline.h’ as ‘\001’ and ‘\002’, respectively).  This may be used
     to embed terminal-specific escape sequences in prompts.  If you
     don't use these indicators, redisplay will likely produce screen
     contents that don't match the line buffer.

 -- Function: int rl_set_prompt (const char *prompt)
     Make Readline use PROMPT for subsequent redisplay.  This calls
     ‘rl_expand_prompt()’ to expand the prompt and sets ‘rl_prompt’ to
     the result.


File: readline.info,  Node: Modifying Text,  Next: Character Input,  Prev: Redisplay,  Up: Readline Convenience Functions

2.4.7 Modifying Text
--------------------

 -- Function: int rl_insert_text (const char *text)
     Insert TEXT into the line at the current cursor position.  Returns
     the number of characters inserted.

 -- Function: int rl_delete_text (int start, int end)
     Delete the text between START and END in the current line.  Returns
     the number of characters deleted.

 -- Function: char * rl_copy_text (int start, int end)
     Return a copy of the text between START and END in the current
     line.

 -- Function: int rl_kill_text (int start, int end)
     Copy the text between START and END in the current line to the kill
     ring, appending or prepending to the last kill if the last command
     was a kill command.  This deletes the text from the line.  If START
     is less than END, the text is appended, otherwise it is prepended.
     If the last command was not a kill, this uses a new kill ring slot.

 -- Function: void rl_replace_line (const char *text, int clear_undo)
     Replace the contents of ‘rl_line_buffer’ with TEXT.  This preserves
     the point and mark, if possible.  If CLEAR_UNDO is non-zero, this
     clears the undo list associated with the current line.

 -- Function: int rl_push_macro_input (char *macro)
     Insert MACRO into the line, as if it had been invoked by a key
     bound to a macro.  Not especially useful; use ‘rl_insert_text()’
     instead.


File: readline.info,  Node: Character Input,  Next: Terminal Management,  Prev: Modifying Text,  Up: Readline Convenience Functions

2.4.8 Character Input
---------------------

 -- Function: int rl_read_key (void)
     Return the next character available from Readline's current input
     stream.  This handles input inserted into the input stream via
     RL_PENDING_INPUT (*note Readline Variables::) and
     ‘rl_stuff_char()’, macros, and characters read from the keyboard.
     While waiting for input, this function will call any function
     assigned to the ‘rl_event_hook’ variable.

 -- Function: int rl_getc (FILE *stream)
     Return the next character available from STREAM, which is assumed
     to be the keyboard.

 -- Function: int rl_stuff_char (int c)
     Insert C into the Readline input stream.  It will be "read" before
     Readline attempts to read characters from the terminal with
     ‘rl_read_key()’.  Applications can push back up to 512 characters.
     ‘rl_stuff_char’ returns 1 if the character was successfully
     inserted; 0 otherwise.

 -- Function: int rl_execute_next (int c)
     Make C be the next command to be executed when ‘rl_read_key()’ is
     called.  This sets RL_PENDING_INPUT.

 -- Function: int rl_clear_pending_input (void)
     Unset RL_PENDING_INPUT, effectively negating the effect of any
     previous call to ‘rl_execute_next()’.  This works only if the
     pending input has not already been read with ‘rl_read_key()’.

 -- Function: int rl_set_keyboard_input_timeout (int u)
     While waiting for keyboard input in ‘rl_read_key()’, Readline will
     wait for U microseconds for input before calling any function
     assigned to ‘rl_event_hook’.  U must be greater than or equal to
     zero (a zero-length timeout is equivalent to a poll).  The default
     waiting period is one-tenth of a second.  Returns the old timeout
     value.

 -- Function: int rl_set_timeout (unsigned int secs, unsigned int usecs)
     Set a timeout for subsequent calls to ‘readline()’.  If Readline
     does not read a complete line, or the number of characters
     specified by ‘rl_num_chars_to_read’, before the duration specified
     by SECS (in seconds) and USECS (microseconds), it returns and sets
     ‘RL_STATE_TIMEOUT’ in ‘rl_readline_state’.  Passing 0 for ‘secs’
     and ‘usecs’ cancels any previously set timeout; the convenience
     macro ‘rl_clear_timeout()’ is shorthand for this.  Returns 0 if the
     timeout is set successfully.

 -- Function: int rl_timeout_remaining (unsigned int *secs, unsigned int
          *usecs)
     Return the number of seconds and microseconds remaining in the
     current timeout duration in *SECS and *USECS, respectively.  Both
     *SECS and *USECS must be non-NULL to return any values.  The return
     value is -1 on error or when there is no timeout set, 0 when the
     timeout has expired (leaving *SECS and *USECS unchanged), and 1 if
     the timeout has not expired.  If either of SECS and USECS is
     ‘NULL’, the return value indicates whether the timeout has expired.


File: readline.info,  Node: Terminal Management,  Next: Utility Functions,  Prev: Character Input,  Up: Readline Convenience Functions

2.4.9 Terminal Management
-------------------------

 -- Function: void rl_prep_terminal (int meta_flag)
     Modify the terminal settings for Readline's use, so ‘readline()’
     can read a single character at a time from the keyboard and perform
     redisplay.  The META_FLAG argument should be non-zero if Readline
     should read eight-bit input.

 -- Function: void rl_deprep_terminal (void)
     Undo the effects of ‘rl_prep_terminal()’, leaving the terminal in
     the state in which it was before the most recent call to
     ‘rl_prep_terminal()’.

 -- Function: void rl_tty_set_default_bindings (Keymap kmap)
     Read the operating system's terminal editing characters (as would
     be displayed by ‘stty’) to their Readline equivalents.  The
     bindings are performed in KMAP.

 -- Function: void rl_tty_unset_default_bindings (Keymap kmap)
     Reset the bindings manipulated by ‘rl_tty_set_default_bindings’ so
     that the terminal editing characters are bound to ‘rl_insert’.  The
     bindings are performed in KMAP.

 -- Function: int rl_tty_set_echoing (int value)
     Set Readline's idea of whether or not it is echoing output to its
     output stream (RL_OUTSTREAM).  If VALUE is 0, Readline does not
     display output to RL_OUTSTREAM; any other value enables output.
     The initial value is set when Readline initializes the terminal
     settings.  This function returns the previous value.

 -- Function: int rl_reset_terminal (const char *terminal_name)
     Reinitialize Readline's idea of the terminal settings using
     TERMINAL_NAME as the terminal type (e.g., ‘xterm’).  If
     TERMINAL_NAME is ‘NULL’, Readline uses the value of the ‘TERM’
     environment variable.


File: readline.info,  Node: Utility Functions,  Next: Miscellaneous Functions,  Prev: Terminal Management,  Up: Readline Convenience Functions

2.4.10 Utility Functions
------------------------

 -- Function: int rl_save_state (struct readline_state *sp)
     Save a snapshot of Readline's internal state to SP.  The contents
     of the READLINE_STATE structure are documented in ‘readline.h’.
     The caller is responsible for allocating the structure.

 -- Function: int rl_restore_state (struct readline_state *sp)
     Restore Readline's internal state to that stored in SP, which must
     have been saved by a call to ‘rl_save_state’.  The contents of the
     READLINE_STATE structure are documented in ‘readline.h’.  The
     caller is responsible for freeing the structure.

 -- Function: void rl_free (void *mem)
     Deallocate the memory pointed to by MEM.  MEM must have been
     allocated by ‘malloc’.

 -- Function: void rl_extend_line_buffer (int len)
     Ensure that ‘rl_line_buffer’ has enough space to hold LEN
     characters, reallocating it if necessary.

 -- Function: int rl_initialize (void)
     Initialize or re-initialize Readline's internal state.  It's not
     strictly necessary to call this; ‘readline()’ calls it before
     reading any input.

 -- Function: int rl_ding (void)
     Ring the terminal bell, obeying the setting of ‘bell-style’.

 -- Function: int rl_alphabetic (int c)
     Return 1 if C is an alphabetic character.

 -- Function: void rl_display_match_list (char **matches, int len, int
          max)
     A convenience function for displaying a list of strings in columnar
     format on Readline's output stream.  ‘matches’ is the list of
     strings, in argv format, such as a list of completion matches.
     ‘len’ is the number of strings in ‘matches’, and ‘max’ is the
     length of the longest string in ‘matches’.  This function uses the
     setting of ‘print-completions-horizontally’ to select how the
     matches are displayed (*note Readline Init File Syntax::).  When
     displaying completions, this function sets the number of columns
     used for display to the value of ‘completion-display-width’, the
     value of the environment variable ‘COLUMNS’, or the screen width,
     in that order.

   The following are implemented as macros, defined in ‘chardefs.h’.
Applications should refrain from using them.

 -- Function: int _rl_uppercase_p (int c)
     Return 1 if C is an uppercase alphabetic character.

 -- Function: int _rl_lowercase_p (int c)
     Return 1 if C is a lowercase alphabetic character.

 -- Function: int _rl_digit_p (int c)
     Return 1 if C is a numeric character.

 -- Function: int _rl_to_upper (int c)
     If C is a lowercase alphabetic character, return the corresponding
     uppercase character.

 -- Function: int _rl_to_lower (int c)
     If C is an uppercase alphabetic character, return the corresponding
     lowercase character.

 -- Function: int _rl_digit_value (int c)
     If C is a number, return the value it represents.


File: readline.info,  Node: Miscellaneous Functions,  Next: Alternate Interface,  Prev: Utility Functions,  Up: Readline Convenience Functions

2.4.11 Miscellaneous Functions
------------------------------

 -- Function: int rl_macro_bind (const char *keyseq, const char *macro,
          Keymap map)
     Bind the key sequence KEYSEQ to invoke the macro MACRO.  The
     binding is performed in MAP.  When KEYSEQ is invoked, the MACRO
     will be inserted into the line.  This function is deprecated; use
     ‘rl_generic_bind’ instead.

 -- Function: void rl_macro_dumper (int readable)
     Print the key sequences bound to macros and their values, using the
     current keymap, to ‘rl_outstream’.  If the application has assigned
     a value to ‘rl_macro_display_hook’, ‘rl_macro_dumper’ calls it
     instead of printing anything.  If READABLE is greater than zero,
     the list is formatted in such a way that it can be made part of an
     ‘inputrc’ file and re-read.

 -- Function: int rl_variable_bind (const char *variable, const char
          *value)
     Make the Readline variable VARIABLE have VALUE.  This behaves as if
     the Readline command ‘set VARIABLE VALUE’ had been executed in an
     ‘inputrc’ file (*note Readline Init File Syntax::) or by
     ‘rl_parse_and_bind’.

 -- Function: char * rl_variable_value (const char *variable)
     Return a string representing the value of the Readline variable
     VARIABLE.  For boolean variables, this string is either ‘on’ or
     ‘off’.

 -- Function: void rl_variable_dumper (int readable)
     Print the Readline variable names and their current values to
     ‘rl_outstream’.  If READABLE is non-zero, the list is formatted in
     such a way that it can be made part of an ‘inputrc’ file and
     re-read.

 -- Function: int rl_set_paren_blink_timeout (int u)
     Set the time interval (in microseconds) that Readline waits when
     showing a balancing character when ‘blink-matching-paren’ has been
     enabled.

 -- Function: char * rl_get_termcap (const char *cap)
     Retrieve the string value of the termcap capability CAP.  Readline
     fetches the termcap entry for the current terminal name and uses
     those capabilities to move around the screen line and perform other
     terminal-specific operations, like erasing a line.  Readline does
     not fetch or use all of a terminal's capabilities, and this
     function will return values for only those capabilities Readline
     fetches.

 -- Function: void rl_reparse_colors (void)
     Read or re-read color definitions from ‘LS_COLORS’.

 -- Function: void rl_clear_history (void)
     Clear the history list by deleting all of the entries, in the same
     manner as the History library's ‘clear_history()’ function.  This
     differs from ‘clear_history’ because it frees private data Readline
     saves in the history list.

 -- Function: void rl_activate_mark (void)
     Enable an _active_ region.  When this is enabled, the text between
     point and mark (the REGION) is displayed using the color specified
     by the value of the ‘active-region-start-color’ variable (a FACE).
     The default face is the terminal's standout mode.  This is called
     by various Readline functions that set the mark and insert text,
     and is available for applications to call.

 -- Function: void rl_deactivate_mark (void)
     Turn off the active region.

 -- Function: void rl_keep_mark_active (void)
     Indicate that the mark should remain active when the current
     Readline function completes and after redisplay occurs.  In most
     cases, the mark remains active for only the duration of a single
     bindable Readline function.

 -- Function: int rl_mark_active_p (void)
     Return a non-zero value if the mark is currently active; zero
     otherwise.


File: readline.info,  Node: Alternate Interface,  Next: A Readline Example,  Prev: Miscellaneous Functions,  Up: Readline Convenience Functions

2.4.12 Alternate Interface
--------------------------

For applications that need more granular control than plain ‘readline()’
provides, there is an alternate interface.  Some applications need to
interleave keyboard I/O with file, device, or window system I/O,
typically by using a main loop to ‘select()’ on various file
descriptors.  To accommodate this use case, Readline can also be invoked
as a 'callback' function from an event loop.  There are functions
available to make this easy.

 -- Function: void rl_callback_handler_install (const char *prompt,
          rl_vcpfunc_t *line_handler)
     Set up the terminal for Readline I/O and display the initial
     expanded value of PROMPT.  Save the value of LINE_HANDLER to use as
     a handler function to call when a complete line of input has been
     entered.  The handler function receives the text of the line as an
     argument.  As with ‘readline()’, the handler function should ‘free’
     the line when it it finished with it.

 -- Function: void rl_callback_read_char (void)
     Whenever an application determines that keyboard input is
     available, it should call ‘rl_callback_read_char()’, which will
     read the next character from the current input source.  If that
     character completes the line, ‘rl_callback_read_char’ will invoke
     the LINE_HANDLER function installed by
     ‘rl_callback_handler_install’ to process the line.  Before calling
     the LINE_HANDLER function, Readline resets the terminal settings to
     the values they had before calling ‘rl_callback_handler_install’.
     If the LINE_HANDLER function returns, and the line handler remains
     installed, Readline modifies the terminal settings for its use
     again.  ‘EOF’ is indicated by calling LINE_HANDLER with a ‘NULL’
     line.

 -- Function: void rl_callback_sigcleanup (void)
     Clean up any internal state the callback interface uses to maintain
     state between calls to rl_callback_read_char (e.g., the state of
     any active incremental searches).  This is intended to be used by
     applications that wish to perform their own signal handling;
     Readline's internal signal handler calls this when appropriate.

 -- Function: void rl_callback_handler_remove (void)
     Restore the terminal to its initial state and remove the line
     handler.  You may call this function from within a callback as well
     as independently.  If the LINE_HANDLER installed by
     ‘rl_callback_handler_install’ does not exit the program, your
     program should call either this function or the function referred
     to by the value of ‘rl_deprep_term_function’ before the program
     exits to reset the terminal settings.


File: readline.info,  Node: A Readline Example,  Next: Alternate Interface Example,  Prev: Alternate Interface,  Up: Readline Convenience Functions

2.4.13 A Readline Example
-------------------------

Here is a function which changes lowercase characters to their uppercase
equivalents, and uppercase characters to lowercase.  If this function
was bound to ‘M-c’, then typing ‘M-c’ would change the case of the
character under point.  Typing ‘M-1 0 M-c’ would change the case of the
following 10 characters, leaving the cursor on the last character
changed.

     /* Invert the case of the COUNT following characters. */
     int
     invert_case_line (count, key)
          int count, key;
     {
       int start, end, i;

       start = rl_point;

       if (rl_point >= rl_end)
         return (0);

       /* Find the end of the range to modify. */
       end = start + count;

       /* Force it to be within range. */
       if (end > rl_end)
         end = rl_end;
       else if (end < 0)
         end = 0;

       if (start == end)
         return (0);

       /* For positive arguments, put point after the last changed character. For
          negative arguments, put point before the last changed character. */
       rl_point = end;

       /* Swap start and end if we are moving backwards */
       if (start > end)
         {
           int temp = start;
           start = end;
           end = temp;
         }

       /* Tell readline that we are modifying the line,
          so it will save the undo information. */
       rl_modifying (start, end);

       for (i = start; i != end; i++)
         {
           if (_rl_uppercase_p (rl_line_buffer[i]))
             rl_line_buffer[i] = _rl_to_lower (rl_line_buffer[i]);
           else if (_rl_lowercase_p (rl_line_buffer[i]))
             rl_line_buffer[i] = _rl_to_upper (rl_line_buffer[i]);
         }

       return (0);
     }


File: readline.info,  Node: Alternate Interface Example,  Prev: A Readline Example,  Up: Readline Convenience Functions

2.4.14 Alternate Interface Example
----------------------------------

Here is a complete program that illustrates Readline's alternate
interface.  It reads lines from the terminal and displays them,
providing the standard history and TAB completion functions.  It
understands the EOF character or "exit" to exit the program.

     /* Standard include files. stdio.h is required. */
     #include <stdlib.h>
     #include <string.h>
     #include <unistd.h>

     /* Used for select(2) */
     #include <sys/types.h>
     #include <sys/select.h>

     #include <signal.h>

     #include <errno.h>
     #include <stdio.h>

     #include <locale.h>

     /* Standard readline include files. */
     #include <readline/readline.h>
     #include <readline/history.h>

     #if !defined (errno)
     extern int errno;
     #endif

     static void cb_linehandler (char *);
     static void sighandler (int);

     int running;
     int sigwinch_received;
     const char *prompt = "rltest$ ";

     /* Handle SIGWINCH and window size changes when readline is not active and
        reading a character. */
     static void
     sighandler (int sig)
     {
       sigwinch_received = 1;
     }

     /* Callback function called for each line when accept-line executed, EOF
        seen, or EOF character read.  This sets a flag and returns; it could
        also call exit(3). */
     static void
     cb_linehandler (char *line)
     {
       /* Can use ^D (stty eof) or `exit' to exit. */
       if (line == NULL || strcmp (line, "exit") == 0)
         {
           if (line == 0)
             printf ("\n");
           printf ("exit\n");
           /* This function needs to be called to reset the terminal settings,
              and calling it from the line handler keeps one extra prompt from
              being displayed. */
           rl_callback_handler_remove ();

           running = 0;
         }
       else
         {
           if (*line)
             add_history (line);
           printf ("input line: %s\n", line);
           free (line);
         }
     }

     int
     main (int c, char **v)
     {
       fd_set fds;
       int r;

       /* Set the default locale values according to environment variables. */
       setlocale (LC_ALL, "");

       /* Handle window size changes when readline is not active and reading
          characters. */
       signal (SIGWINCH, sighandler);

       /* Install the line handler. */
       rl_callback_handler_install (prompt, cb_linehandler);

       /* Enter a simple event loop.  This waits until something is available
          to read on readline's input stream (defaults to standard input) and
          calls the builtin character read callback to read it.  It does not
          have to modify the user's terminal settings. */
       running = 1;
       while (running)
         {
           FD_ZERO (&fds);
           FD_SET (fileno (rl_instream), &fds);

           r = select (FD_SETSIZE, &fds, NULL, NULL, NULL);
           if (r < 0 && errno != EINTR)
             {
               perror ("rltest: select");
               rl_callback_handler_remove ();
               break;
             }
           if (sigwinch_received)
     	{
     	  rl_resize_terminal ();
     	  sigwinch_received = 0;
     	}
           if (r < 0)
     	continue;

           if (FD_ISSET (fileno (rl_instream), &fds))
             rl_callback_read_char ();
         }

       printf ("rltest: Event loop has exited\n");
       return 0;
     }


File: readline.info,  Node: Readline Signal Handling,  Next: Custom Completers,  Prev: Readline Convenience Functions,  Up: Programming with GNU Readline

2.5 Readline Signal Handling
============================

Signals are asynchronous events sent to a process by the Unix kernel,
sometimes on behalf of another process.  They are intended to indicate
exceptional events, like a user pressing the terminal's interrupt key,
or a network connection being broken.  There is a class of signals that
can be sent to the process currently reading input from the keyboard.
Since Readline changes the terminal attributes when it is called, it
needs to perform special processing when such a signal is received in
order to restore the terminal to a sane state, or provide applications
using Readline with functions to do so manually.

   Readline contains an internal signal handler that is installed for a
number of signals (‘SIGINT’, ‘SIGQUIT’, ‘SIGTERM’, ‘SIGHUP’, ‘SIGALRM’,
‘SIGTSTP’, ‘SIGTTIN’, and ‘SIGTTOU’).  When Readline receives one of
these signals, the signal handler will reset the terminal attributes to
those that were in effect before ‘readline()’ was called, reset the
signal handling to what it was before ‘readline()’ was called, and
resend the signal to the calling application.  If and when the calling
application's signal handler returns, Readline will reinitialize the
terminal and continue to accept input.  When a ‘SIGINT’ is received, the
Readline signal handler performs some additional work, which will cause
any partially-entered line to be aborted (see the description of
‘rl_free_line_state()’ below).

   There is an additional Readline signal handler, for ‘SIGWINCH’, which
the kernel sends to a process whenever the terminal's size changes (for
example, if a user resizes an ‘xterm’).  The Readline ‘SIGWINCH’ handler
updates Readline's internal screen size information, and then calls any
‘SIGWINCH’ signal handler the calling application has installed.
Readline calls the application's ‘SIGWINCH’ signal handler without
resetting the terminal to its original state.  If the application's
signal handler does more than update its idea of the terminal size and
return (for example, a ‘longjmp’ back to a main processing loop), it
_must_ call ‘rl_cleanup_after_signal()’ (described below), to restore
the terminal state.

   When an application is using the callback interface (*note Alternate
Interface::), Readline installs signal handlers only for the duration of
the call to ‘rl_callback_read_char’.  Applications using the callback
interface should be prepared to clean up Readline's state if they wish
to handle the signal before the line handler completes and restores the
terminal state.

   If an application using the callback interface wishes to have
Readline install its signal handlers at the time the application calls
‘rl_callback_handler_install’ and remove them only when a complete line
of input has been read, it should set the
‘rl_persistent_signal_handlers’ variable to a non-zero value.  This
allows an application to defer all of the handling of the signals
Readline catches to Readline.  Applications should use this variable
with care; it can result in Readline catching signals and not acting on
them (or allowing the application to react to them) until the
application calls ‘rl_callback_read_char’.  This can result in an
application becoming less responsive to keyboard signals like SIGINT. If
an application does not want or need to perform any signal handling, or
does not need to do any processing between calls to
‘rl_callback_read_char’, setting this variable may be appropriate.

   Readline provides two variables that allow application writers to
control whether or not it will catch certain signals and act on them
when they are received.  It is important that applications change the
values of these variables only when calling ‘readline()’, not in a
signal handler, so Readline's internal signal state is not corrupted.

 -- Variable: int rl_catch_signals
     If this variable is non-zero, Readline will install signal handlers
     for ‘SIGINT’, ‘SIGQUIT’, ‘SIGTERM’, ‘SIGHUP’, ‘SIGALRM’, ‘SIGTSTP’,
     ‘SIGTTIN’, and ‘SIGTTOU’.

     The default value of ‘rl_catch_signals’ is 1.

 -- Variable: int rl_catch_sigwinch
     If this variable is set to a non-zero value, Readline will install
     a signal handler for ‘SIGWINCH’.

     The default value of ‘rl_catch_sigwinch’ is 1.

 -- Variable: int rl_persistent_signal_handlers
     If an application using the callback interface wishes Readline's
     signal handlers to be installed and active during the set of calls
     to ‘rl_callback_read_char’ that constitutes an entire single line,
     it should set this variable to a non-zero value.

     The default value of ‘rl_persistent_signal_handlers’ is 0.

 -- Variable: int rl_change_environment
     If this variable is set to a non-zero value, and Readline is
     handling ‘SIGWINCH’, Readline will modify the LINES and COLUMNS
     environment variables upon receipt of a ‘SIGWINCH’.

     The default value of ‘rl_change_environment’ is 1.

   If an application does not wish to have Readline catch any signals,
or to handle signals other than those Readline catches (‘SIGHUP’, for
example), Readline provides convenience functions to do the necessary
terminal and internal state cleanup upon receipt of a signal.

 -- Function: int rl_pending_signal (void)
     Return the signal number of the most recent signal Readline
     received but has not yet handled, or 0 if there is no pending
     signal.

 -- Function: void rl_cleanup_after_signal (void)
     This function will reset the state of the terminal to what it was
     before ‘readline()’ was called, and remove the Readline signal
     handlers for all signals, depending on the values of
     ‘rl_catch_signals’ and ‘rl_catch_sigwinch’.

 -- Function: void rl_free_line_state (void)
     This will free any partial state associated with the current input
     line (undo information, any partial history entry, any
     partially-entered keyboard macro, and any partially-entered numeric
     argument).  This should be called before
     ‘rl_cleanup_after_signal()’.  The Readline signal handler for
     ‘SIGINT’ calls this to abort the current input line.

 -- Function: void rl_reset_after_signal (void)
     This will reinitialize the terminal and reinstall any Readline
     signal handlers, depending on the values of ‘rl_catch_signals’ and
     ‘rl_catch_sigwinch’.

   If an application wants to force Readline to handle any signals that
have arrived while it has been executing, ‘rl_check_signals()’ will call
Readline's internal signal handler if there are any pending signals.
This is primarily intended for those applications that use a custom
‘rl_getc_function’ (*note Readline Variables::) and wish to handle
signals received while waiting for input.

 -- Function: void rl_check_signals (void)
     If there are any pending signals, call Readline's internal signal
     handling functions to process them.  ‘rl_pending_signal()’ can be
     used independently to determine whether or not there are any
     pending signals.

   If an application does not wish Readline to catch ‘SIGWINCH’, it may
call ‘rl_resize_terminal()’ or ‘rl_set_screen_size()’ to force Readline
to update its idea of the terminal size when it receives a ‘SIGWINCH’.

 -- Function: void rl_echo_signal_char (int sig)
     If an application wishes to install its own signal handlers, but
     still have Readline display characters that generate signals,
     calling this function with SIG set to ‘SIGINT’, ‘SIGQUIT’, or
     ‘SIGTSTP’ will display the character generating that signal.

 -- Function: void rl_resize_terminal (void)
     Update Readline's internal screen size by reading values from the
     kernel.

 -- Function: void rl_set_screen_size (int rows, int cols)
     Set Readline's idea of the terminal size to ROWS rows and COLS
     columns.  If either ROWS or COLUMNS is less than or equal to 0,
     Readline doesn't change that terminal dimension.  This is intended
     to tell Readline the physical dimensions of the terminal, and is
     used internally to calculate the maximum number of characters that
     may appear on a single line and on the screen.

   If an application does not want to install a ‘SIGWINCH’ handler, but
is still interested in the screen dimensions, it may query Readline's
idea of the screen size.

 -- Function: void rl_get_screen_size (int *rows, int *cols)
     Return Readline's idea of the terminal's size in the variables
     pointed to by the arguments.

 -- Function: void rl_reset_screen_size (void)
     Cause Readline to reobtain the screen size and recalculate its
     dimensions.

   The following functions install and remove Readline's signal
handlers.

 -- Function: int rl_set_signals (void)
     Install Readline's signal handler for ‘SIGINT’, ‘SIGQUIT’,
     ‘SIGTERM’, ‘SIGHUP’, ‘SIGALRM’, ‘SIGTSTP’, ‘SIGTTIN’, ‘SIGTTOU’,
     and ‘SIGWINCH’, depending on the values of ‘rl_catch_signals’ and
     ‘rl_catch_sigwinch’.

 -- Function: int rl_clear_signals (void)
     Remove all of the Readline signal handlers installed by
     ‘rl_set_signals()’.


File: readline.info,  Node: Custom Completers,  Prev: Readline Signal Handling,  Up: Programming with GNU Readline

2.6 Custom Completers
=====================

Typically, a program that reads commands from the user has a way of
disambiguating commands and data.  If your program is one of these, then
it can provide completion for commands, data, or both.  The following
sections describe how your program and Readline cooperate to provide
this service.

* Menu:

* How Completing Works::	The logic used to do completion.
* Completion Functions::	Functions provided by Readline.
* Completion Variables::	Variables which control completion.
* A Short Completion Example::	An example of writing completer subroutines.


File: readline.info,  Node: How Completing Works,  Next: Completion Functions,  Up: Custom Completers

2.6.1 How Completing Works
--------------------------

In order to complete some text, the full list of possible completions
must be available.  That is, it is not possible to accurately expand a
partial word without knowing all of the possible words which make sense
in that context.  The Readline library provides the user interface to
completion, and two of the most common completion functions: filename
and username.  For completing other types of text, you must write your
own completion function.  This section describes exactly what such
functions must do, and provides an example.

   There are three major functions used to perform completion:

  1. The user-interface function ‘rl_complete()’.  This function is
     called with the same arguments as other bindable Readline
     functions: COUNT and INVOKING_KEY.  It isolates the word to be
     completed and calls ‘rl_completion_matches()’ to generate a list of
     possible completions.  It then either lists the possible
     completions, inserts the possible completions, or actually performs
     the completion, depending on which behavior is desired.

  2. The internal function ‘rl_completion_matches()’ uses an
     application-supplied “generator” function to generate the list of
     possible matches, and then returns the array of these matches.  The
     caller should place the address of its generator function in
     ‘rl_completion_entry_function’.

  3. The generator function is called repeatedly from
     ‘rl_completion_matches()’, returning a string each time.  The
     arguments to the generator function are TEXT and STATE.  TEXT is
     the partial word to be completed.  STATE is zero the first time the
     function is called, allowing the generator to perform any necessary
     initialization, and a positive integer for each subsequent call.
     The generator function returns ‘(char *)NULL’ to inform
     ‘rl_completion_matches()’ that there are no more possibilities
     left.  Usually the generator function computes the list of possible
     completions when STATE is zero, and returns them one at a time on
     subsequent calls.  Each string the generator function returns as a
     match must be allocated with ‘malloc()’; Readline frees the strings
     when it has finished with them.  Such a generator function is
     referred to as an “application-specific completion function”.

 -- Function: int rl_complete (int ignore, int invoking_key)
     Complete the word at or before point.  You have supplied the
     function that does the initial simple matching selection algorithm
     (see ‘rl_completion_matches()’).  The default is to do filename
     completion.

 -- Variable: rl_compentry_func_t * rl_completion_entry_function
     This is a pointer to the generator function for
     ‘rl_completion_matches()’.  If the value of
     ‘rl_completion_entry_function’ is ‘NULL’ then Readline uses the
     default filename generator function,
     ‘rl_filename_completion_function()’.  An “application-specific
     completion function” is a function whose address is assigned to
     ‘rl_completion_entry_function’ and whose return values are used to
     generate possible completions.


File: readline.info,  Node: Completion Functions,  Next: Completion Variables,  Prev: How Completing Works,  Up: Custom Completers

2.6.2 Completion Functions
--------------------------

Here is the complete list of callable completion functions present in
Readline.

 -- Function: int rl_complete_internal (int what_to_do)
     Complete the word at or before point.  WHAT_TO_DO says what to do
     with the completion.  A value of ‘?’ means list the possible
     completions.  ‘TAB’ means do standard completion.  ‘*’ means insert
     all of the possible completions.  ‘!’ means to display all of the
     possible completions, if there is more than one, as well as
     performing partial completion.  ‘@’ is similar to ‘!’, but does not
     list possible completions if the possible completions share a
     common prefix.

 -- Function: int rl_complete (int ignore, int invoking_key)
     Complete the word at or before point.  You have supplied the
     function that does the initial simple matching selection algorithm
     (see ‘rl_completion_matches()’ and ‘rl_completion_entry_function’).
     The default is to do filename completion.  This calls
     ‘rl_complete_internal()’ with an argument depending on
     INVOKING_KEY.

 -- Function: int rl_possible_completions (int count, int invoking_key)
     List the possible completions.  See description of ‘rl_complete()’.
     This calls ‘rl_complete_internal()’ with an argument of ‘?’.

 -- Function: int rl_insert_completions (int count, int invoking_key)
     Insert the list of possible completions into the line, deleting the
     partially-completed word.  See description of ‘rl_complete()’.
     This calls ‘rl_complete_internal()’ with an argument of ‘*’.

 -- Function: int rl_completion_mode (rl_command_func_t *cfunc)
     Returns the appropriate value to pass to ‘rl_complete_internal()’
     depending on whether CFUNC was called twice in succession and the
     values of the ‘show-all-if-ambiguous’ and ‘show-all-if-unmodified’
     variables.  Application-specific completion functions may use this
     function to present the same interface as ‘rl_complete()’.

 -- Function: char ** rl_completion_matches (const char *text,
          rl_compentry_func_t *entry_func)
     Returns an array of strings which is a list of completions for
     TEXT.  If there are no completions, returns ‘NULL’.  The first
     entry in the returned array is the substitution for TEXT.  The
     remaining entries are the possible completions.  The array is
     terminated with a ‘NULL’ pointer.

     ENTRY_FUNC is a function of two args, and returns a ‘char *’.  The
     first argument is TEXT.  The second is a state argument; it is zero
     on the first call, and non-zero on subsequent calls.  ENTRY_FUNC
     returns a ‘NULL’ pointer to the caller when there are no more
     matches.

 -- Function: char * rl_filename_completion_function (const char *text,
          int state)
     A generator function for filename completion in the general case.
     TEXT is a partial filename.  The Bash source is a useful reference
     for writing application-specific completion functions (the Bash
     completion functions call this and other Readline functions).

 -- Function: char * rl_username_completion_function (const char *text,
          int state)
     A completion generator for usernames.  TEXT contains a partial
     username preceded by a random character (usually ‘~’).  As with all
     completion generators, STATE is zero on the first call and non-zero
     for subsequent calls.


File: readline.info,  Node: Completion Variables,  Next: A Short Completion Example,  Prev: Completion Functions,  Up: Custom Completers

2.6.3 Completion Variables
--------------------------

 -- Variable: rl_compentry_func_t * rl_completion_entry_function
     A pointer to the generator function for ‘rl_completion_matches()’.
     ‘NULL’ means to use ‘rl_filename_completion_function()’, the
     default filename completer.

 -- Variable: rl_completion_func_t * rl_attempted_completion_function
     A pointer to an alternative function to create matches.  The
     function is called with TEXT, START, and END.  START and END are
     indices in ‘rl_line_buffer’ defining the boundaries of TEXT, which
     is a character string.  If this function exists and returns ‘NULL’,
     or if this variable is set to ‘NULL’, then ‘rl_complete()’ will
     call the value of ‘rl_completion_entry_function’ to generate
     matches, otherwise completion will use the array of strings this
     function returns.  If this function sets the
     ‘rl_attempted_completion_over’ variable to a non-zero value,
     Readline will not perform its default completion even if this
     function returns no matches.

 -- Variable: rl_quote_func_t * rl_filename_quoting_function
     A pointer to a function that will quote a filename in an
     application-specific fashion.  Readline calls this function during
     filename completion if one of the characters in
     ‘rl_filename_quote_characters’ appears in a completed filename.
     The function is called with TEXT, MATCH_TYPE, and QUOTE_POINTER.
     The TEXT is the filename to be quoted.  The MATCH_TYPE is either
     ‘SINGLE_MATCH’, if there is only one completion match, or
     ‘MULT_MATCH’.  Some functions use this to decide whether or not to
     insert a closing quote character.  The QUOTE_POINTER is a pointer
     to any opening quote character the user typed.  Some functions
     choose to reset this character if they decide to quote the filename
     in a different style.  It's preferable to preserve the user's
     quoting as much as possible - it's less disruptive.

 -- Variable: rl_dequote_func_t * rl_filename_dequoting_function
     A pointer to a function that will remove application-specific
     quoting characters from a filename before attempting completion, so
     those characters do not interfere with matching the text against
     names in the filesystem.  It is called with TEXT, the text of the
     word to be dequoted, and QUOTE_CHAR, which is the quoting character
     that delimits the filename (usually ‘'’ or ‘"’).  If QUOTE_CHAR is
     zero, the filename was not in a quoted string.

 -- Variable: rl_linebuf_func_t * rl_char_is_quoted_p
     A pointer to a function to call that determines whether or not a
     specific character in the line buffer is quoted, according to
     whatever quoting mechanism the application uses.  The function is
     called with two arguments: TEXT, the text of the line, and INDEX,
     the index of the character in the line.  It is used to decide
     whether a character found in ‘rl_completer_word_break_characters’
     should be used to break words for the completer.

 -- Variable: rl_compignore_func_t * rl_ignore_some_completions_function
     Readline calls this function, if defined, when filename completion
     is done, after all the matching names have been generated.  It is
     passed a ‘NULL’ terminated array of matches.  The first element
     (‘matches[0]’) is the maximal substring common to all matches.
     This function can re-arrange the list of matches as required, but
     must free each element it deletes from the array.

 -- Variable: rl_icppfunc_t * rl_directory_completion_hook
     This function, if defined, is allowed to modify the directory
     portion of filenames during completion.  It could be used to expand
     symbolic links or shell variables in pathnames.  It is called with
     the address of a string (the current directory name) as an
     argument, and may modify that string.  If the function replaces the
     string with a new string, it should free the old value.  Any
     modified directory name should have a trailing slash.  The modified
     value will be used as part of the completion, replacing the
     directory portion of the pathname the user typed.  At the least,
     even if no other expansion is performed, this function should
     remove any quote characters from the directory name, because its
     result will be passed directly to ‘opendir()’.

     The directory completion hook returns an integer that should be
     non-zero if the function modifies its directory argument.  The
     function should not modify the directory argument if it returns 0.

 -- Variable: rl_icppfunc_t * rl_directory_rewrite_hook;
     If non-zero, this is the address of a function to call when
     completing a directory name.  This function takes the address of
     the directory name to be modified as an argument.  Unlike
     ‘rl_directory_completion_hook’, it only modifies the directory name
     used in ‘opendir()’, not what Readline displays when it prints or
     inserts the possible completions.  Readline calls this before
     rl_directory_completion_hook.  At the least, even if no other
     expansion is performed, this function should remove any quote
     characters from the directory name, because its result will be
     passed directly to ‘opendir()’.

     The directory rewrite hook returns an integer that should be
     non-zero if the function modifies its directory argument.  The
     function should not modify the directory argument if it returns 0.

 -- Variable: rl_icppfunc_t * rl_filename_stat_hook
     If non-zero, this is the address of a function for the completer to
     call before deciding which character to append to a completed name.
     This function modifies its filename name argument, and Readline
     passes the modified value to ‘stat()’ to determine the file's type
     and characteristics.  This function does not need to remove quote
     characters from the filename.

     The stat hook returns an integer that should be non-zero if the
     function modifies its directory argument.  The function should not
     modify the directory argument if it returns 0.

 -- Variable: rl_dequote_func_t * rl_filename_rewrite_hook
     If non-zero, this is the address of a function for Readline to call
     when reading directory entries from the filesystem for completion
     and comparing them to the filename portion of the partial word
     being completed.  It modifies the filesystem entries, as opposed to
     ‘rl_completion_rewrite_hook’, which modifies the word being
     completed.  The function takes two arguments: FNAME, the filename
     to be converted, and FNLEN, its length in bytes.  It must either
     return its first argument (if no conversion takes place) or the
     converted filename in newly-allocated memory.  The function should
     perform any necessary application or system-specific conversion on
     the filename, such as converting between character sets or
     converting from a filesystem format to a character input format.
     Readline compares the converted form against the word to be
     completed, and, if it matches, adds it to the list of matches.
     Readline will free the allocated string.

 -- Variable: rl_dequote_func_t * rl_completion_rewrite_hook
     If non-zero, this is the address of a function for Readline to call
     before comparing the filename portion of a word to be completed
     with directory entries from the filesystem.  It modifies the word
     being completed, as opposed to ‘rl_filename_rewrite_hook’, which
     modifies filesystem entries.  The function takes two arguments:
     FNAME, the word to be converted, after any
     ‘rl_filename_dequoting_function’ has been applied, and FNLEN, its
     length in bytes.  It must either return its first argument (if no
     conversion takes place) or the converted filename in
     newly-allocated memory.  The function should perform any necessary
     application or system-specific conversion on the filename, such as
     converting between character sets or converting from a character
     input format to some other format.  Readline compares the converted
     form against directory entries, after their potential modification
     by ‘rl_filename_rewrite_hook’, and adds any matches to the list of
     matches.  Readline will free the allocated string.

 -- Variable: rl_compdisp_func_t * rl_completion_display_matches_hook
     If non-zero, then this is the address of a function to call when
     completing a word would normally display the list of possible
     matches.  Readline calls this function instead of displaying the
     list itself.  It takes three arguments: (‘char **’MATCHES, ‘int’
     NUM_MATCHES, ‘int’ MAX_LENGTH) where MATCHES is the array of
     matching strings, NUM_MATCHES is the number of strings in that
     array, and MAX_LENGTH is the length of the longest string in that
     array.  Readline provides a convenience function,
     ‘rl_display_match_list’, that takes care of doing the display to
     Readline's output stream.  You may call that function from this
     hook.

 -- Variable: const char * rl_basic_word_break_characters
     The basic list of characters that signal a break between words for
     the completer routine.  The default value of this variable is the
     characters which break words for completion in Bash: ‘"
     \t\n\"\\'`@$><=;|&{("’.

 -- Variable: const char * rl_basic_quote_characters
     A list of quote characters which can cause a word break.  The
     default value includes single and double quotes.

 -- Variable: const char * rl_completer_word_break_characters
     The list of characters that signal a break between words for
     ‘rl_complete_internal()’.  These characters determine how Readline
     decides what to complete.  The default list is the value of
     ‘rl_basic_word_break_characters’.

 -- Variable: rl_cpvfunc_t * rl_completion_word_break_hook
     If non-zero, this is the address of a function to call when
     Readline is deciding where to separate words for word completion.
     It should return a character string like
     ‘rl_completer_word_break_characters’ to be used to perform the
     current completion.  The function may choose to set
     ‘rl_completer_word_break_characters’ itself.  If the function
     returns ‘NULL’, Readline uses ‘rl_completer_word_break_characters’.

 -- Variable: const char * rl_completer_quote_characters
     A list of characters which can be used to quote a substring of the
     line.  Completion occurs on the entire substring, and within the
     substring, ‘rl_completer_word_break_characters’ are treated as any
     other character, unless they also appear within this list.

 -- Variable: const char * rl_filename_quote_characters
     A list of characters that cause Readline to quote a filename when
     they appear in a completed filename.  The default is the null
     string.

 -- Variable: const char * rl_special_prefixes
     The list of characters that are word break characters, but should
     be left in TEXT when it is passed to the completion function.
     Programs can use this to help determine what kind of completing to
     do.  For instance, Bash sets this variable to "$@" so that it can
     complete shell variables and hostnames.

 -- Variable: int rl_completion_query_items
     This determines the maximum number of items that
     possible-completions will display unconditionally.  If there are
     more possible completions than this, Readline asks the user for
     confirmation before displaying them.  The default value is 100.  A
     negative value indicates that Readline should never ask for
     confirmation.

 -- Variable: int rl_completion_append_character
     When a single completion alternative matches at the end of the
     command line, Readline appends this character to the inserted
     completion text.  The default is a space character (‘ ’).  Setting
     this to the null character (‘\0’) prevents anything being appended
     automatically.  This can be changed in application-specific
     completion functions to provide the "most sensible word separator
     character" according to an application-specific command line syntax
     specification.  It is set to the default before calling any
     application-specific completion function, and may only be changed
     within such a function.

 -- Variable: int rl_completion_suppress_append
     If non-zero, Readline will not append the
     RL_COMPLETION_APPEND_CHARACTER to matches at the end of the command
     line, as described above.  It is set to 0 before calling any
     application-specific completion function, and may only be changed
     within such a function.

 -- Variable: int rl_completion_suppress_quote
     If non-zero, Readline does not append a matching quote character
     when performing completion on a quoted string.  It is set to 0
     before calling any application-specific completion function, and
     may only be changed within such a function.

 -- Variable: int rl_completion_found_quote
     When Readline is completing quoted text, it sets this variable to a
     non-zero value if the word being completed contains or is delimited
     by any quoting characters, including backslashes.  This is set
     before calling any application-specific completion function.

 -- Variable: int rl_completion_quote_character
     When Readline is completing quoted text, as delimited by one of the
     characters in RL_COMPLETER_QUOTE_CHARACTERS, it sets this variable
     to the quoting character it found.  This is set before calling any
     application-specific completion function.

 -- Variable: int rl_completion_mark_symlink_dirs
     If non-zero, Readline appends a slash to completed filenames that
     are symbolic links to directory names, subject to the value of the
     user-settable MARK-DIRECTORIES variable.  This variable exists so
     that application-specific completion functions can override the
     user's global preference (set via the MARK-SYMLINKED-DIRECTORIES
     Readline variable) if appropriate.  This variable is set to the
     user's preference before calling any application-specific
     completion function, so unless that function modifies the value,
     Readline will honor the user's preferences.

 -- Variable: int rl_ignore_completion_duplicates
     If non-zero, then Readline removes duplicates in the set of
     possible completions.  The default is 1.

 -- Variable: int rl_filename_completion_desired
     A non-zero value means that Readline should treat the results of
     the matches as filenames.  This is _always_ zero when completion is
     attempted, and can only be changed within an application-specific
     completion function.  If it is set to a non-zero value by such a
     function, Readline appends a slash to directory names and attempts
     to quote completed filenames if they contain any characters in
     ‘rl_filename_quote_characters’ and ‘rl_filename_quoting_desired’ is
     set to a non-zero value.

 -- Variable: int rl_filename_quoting_desired
     A non-zero value means that Readline should quote the results of
     the matches using double quotes (or an application-specific quoting
     mechanism) if the completed filename contains any characters in
     ‘rl_filename_quote_chars’.  This is _always_ non-zero when
     completion is attempted, and can only be changed within an
     application-specific completion function.  The quoting is performed
     via a call to the function pointed to by
     ‘rl_filename_quoting_function’.

 -- Variable: int rl_full_quoting_desired
     A non-zero value means that Readline should apply filename-style
     quoting, including any application-specified quoting mechanism, to
     all completion matches even if it is not otherwise treating the
     matches as filenames.  This is _always_ zero when completion is
     attempted, and can only be changed within an application-specific
     completion function.  The quoting is performed via a call to the
     function pointed to by ‘rl_filename_quoting_function’.

 -- Variable: int rl_attempted_completion_over
     If an application-specific completion function assigned to
     ‘rl_attempted_completion_function’ sets this variable to a non-zero
     value, Readline will not perform its default filename completion
     even if the application's completion function returns no matches.
     It should be set only by an application's completion function.

 -- Variable: int rl_sort_completion_matches
     If an application sets this variable to 0, Readline will not sort
     the list of completions (which implies that it cannot remove any
     duplicate completions).  The default value is 1, which means that
     Readline will sort the completions and, depending on the value of
     ‘rl_ignore_completion_duplicates’, will attempt to remove duplicate
     matches.

 -- Variable: int rl_completion_type
     Set to a character describing the type of completion Readline is
     currently attempting; see the description of
     ‘rl_complete_internal()’ (*note Completion Functions::) for the
     list of characters.  This is set to the appropriate value before
     calling any application-specific completion function, so these
     functions can present the same interface as ‘rl_complete()’.

 -- Variable: int rl_completion_invoking_key
     Set to the final character in the key sequence that invoked one of
     the completion functions that call ‘rl_complete_internal()’.  This
     is set to the appropriate value before calling any
     application-specific completion function.

 -- Variable: int rl_inhibit_completion
     If this variable is non-zero, Readline does not perform completion,
     even if a key binding indicates it should.  The completion
     character is inserted as if it were bound to ‘self-insert’.


File: readline.info,  Node: A Short Completion Example,  Prev: Completion Variables,  Up: Custom Completers

2.6.4 A Short Completion Example
--------------------------------

Here is a small application demonstrating the use of the GNU Readline
library.  It is called ‘fileman’, and the source code resides in
‘examples/fileman.c’.  This sample application provides command name
completion, line editing features, and access to the history list.

     /* fileman.c -- A tiny application which demonstrates how to use the
        GNU Readline library.  This application interactively allows users
        to manipulate files and their modes. */

     #ifdef HAVE_CONFIG_H
     #  include <config.h>
     #endif

     #include <sys/types.h>
     #ifdef HAVE_SYS_FILE_H
     #  include <sys/file.h>
     #endif
     #include <sys/stat.h>

     #ifdef HAVE_UNISTD_H
     #  include <unistd.h>
     #endif

     #include <fcntl.h>
     #include <stdio.h>
     #include <errno.h>
     #include <locale.h>

     #if defined (HAVE_STRING_H)
     #  include <string.h>
     #else /* !HAVE_STRING_H */
     #  include <strings.h>
     #endif /* !HAVE_STRING_H */

     #ifdef HAVE_STDLIB_H
     #  include <stdlib.h>
     #endif

     #include <time.h>

     #include <readline/readline.h>
     #include <readline/history.h>

     extern char *xmalloc PARAMS((size_t));

     /* The names of functions that actually do the manipulation. */
     int com_list PARAMS((char *));
     int com_view PARAMS((char *));
     int com_rename PARAMS((char *));
     int com_stat PARAMS((char *));
     int com_pwd PARAMS((char *));
     int com_delete PARAMS((char *));
     int com_help PARAMS((char *));
     int com_cd PARAMS((char *));
     int com_quit PARAMS((char *));

     /* A structure which contains information on the commands this program
        can understand. */

     typedef struct {
       char *name;			/* User printable name of the function. */
       rl_icpfunc_t *func;		/* Function to call to do the job. */
       char *doc;			/* Documentation for this function.  */
     } COMMAND;

     COMMAND commands[] = {
       { "cd", com_cd, "Change to directory DIR" },
       { "delete", com_delete, "Delete FILE" },
       { "help", com_help, "Display this text" },
       { "?", com_help, "Synonym for `help'" },
       { "list", com_list, "List files in DIR" },
       { "ls", com_list, "Synonym for `list'" },
       { "pwd", com_pwd, "Print the current working directory" },
       { "quit", com_quit, "Quit using Fileman" },
       { "rename", com_rename, "Rename FILE to NEWNAME" },
       { "stat", com_stat, "Print out statistics on FILE" },
       { "view", com_view, "View the contents of FILE" },
       { (char *)NULL, (rl_icpfunc_t *)NULL, (char *)NULL }
     };

     /* Forward declarations. */
     char *stripwhite (char *);
     COMMAND *find_command (char *);

     /* The name of this program, as taken from argv[0]. */
     char *progname;

     /* When non-zero, this global means the user is done using this program. */
     int done;

     char *
     dupstr (char *s)
     {
       char *r;

       r = xmalloc (strlen (s) + 1);
       strcpy (r, s);
       return (r);
     }

     int
     main (int argc, char **argv)
     {
       char *line, *s;

       setlocale (LC_ALL, "");

       progname = argv[0];

       initialize_readline ();	/* Bind our completer. */

       /* Loop reading and executing lines until the user quits. */
       for ( ; done == 0; )
         {
           line = readline ("FileMan: ");

           if (!line)
             break;

           /* Remove leading and trailing whitespace from the line.
              Then, if there is anything left, add it to the history list
              and execute it. */
           s = stripwhite (line);

           if (*s)
             {
               add_history (s);
               execute_line (s);
             }

           free (line);
         }
       exit (0);
     }

     /* Execute a command line. */
     int
     execute_line (char *line)
     {
       register int i;
       COMMAND *command;
       char *word;

       /* Isolate the command word. */
       i = 0;
       while (line[i] && whitespace (line[i]))
         i++;
       word = line + i;

       while (line[i] && !whitespace (line[i]))
         i++;

       if (line[i])
         line[i++] = '\0';

       command = find_command (word);

       if (!command)
         {
           fprintf (stderr, "%s: No such command for FileMan.\n", word);
           return (-1);
         }

       /* Get argument to command, if any. */
       while (whitespace (line[i]))
         i++;

       word = line + i;

       /* Call the function. */
       return ((*(command->func)) (word));
     }

     /* Look up NAME as the name of a command, and return a pointer to that
        command.  Return a NULL pointer if NAME isn't a command name. */
     COMMAND *
     find_command (char *name)
     {
       register int i;

       for (i = 0; commands[i].name; i++)
         if (strcmp (name, commands[i].name) == 0)
           return (&commands[i]);

       return ((COMMAND *)NULL);
     }

     /* Strip whitespace from the start and end of STRING.  Return a pointer
        into STRING. */
     char *
     stripwhite (char *string)
     {
       register char *s, *t;

       for (s = string; whitespace (*s); s++)
         ;

       if (*s == 0)
         return (s);

       t = s + strlen (s) - 1;
       while (t > s && whitespace (*t))
         t--;
       *++t = '\0';

       return s;
     }

     /* **************************************************************** */
     /*                                                                  */
     /*                  Interface to Readline Completion                */
     /*                                                                  */
     /* **************************************************************** */

     char *command_generator (const char *, int);
     char **fileman_completion (const char *, int, int);

     /* Tell the GNU Readline library how to complete.  We want to try to complete
        on command names if this is the first word in the line, or on filenames
        if not. */
     void
     initialize_readline (void)
     {
       /* Allow conditional parsing of the ~/.inputrc file. */
       rl_readline_name = "FileMan";

       /* Tell the completer that we want a crack first. */
       rl_attempted_completion_function = fileman_completion;
     }

     /* Attempt to complete on the contents of TEXT.  START and END bound the
        region of rl_line_buffer that contains the word to complete.  TEXT is
        the word to complete.  We can use the entire contents of rl_line_buffer
        in case we want to do some simple parsing.  Return the array of matches,
        or NULL if there aren't any. */
     char **
     fileman_completion (const char *text, int start, int end)
     {
       char **matches;

       matches = (char **)NULL;

       /* If this word is at the start of the line, then it is a command
          to complete.  Otherwise it is the name of a file in the current
          directory. */
       if (start == 0)
         matches = rl_completion_matches (text, command_generator);

       return (matches);
     }

     /* Generator function for command completion.  STATE lets us know whether
        to start from scratch; without any state (i.e. STATE == 0), then we
        start at the top of the list. */
     char *
     command_generator (const char *text, int state)
     {
       static int list_index, len;
       char *name;

       /* If this is a new word to complete, initialize now.  This includes
          saving the length of TEXT for efficiency, and initializing the index
          variable to 0. */
       if (!state)
         {
           list_index = 0;
           len = strlen (text);
         }

       /* Return the next name which partially matches from the command list. */
       while (name = commands[list_index].name)
         {
           list_index++;

           if (strncmp (name, text, len) == 0)
             return (dupstr(name));
         }

       /* If no names matched, then return NULL. */
       return ((char *)NULL);
     }

     /* **************************************************************** */
     /*                                                                  */
     /*                       FileMan Commands                           */
     /*                                                                  */
     /* **************************************************************** */

     /* String to pass to system ().  This is for the LIST, VIEW and RENAME
        commands. */
     static char syscom[1024];

     /* List the file(s) named in arg. */
     int
     com_list (char *arg)
     {
       if (!arg)
         arg = "";

       snprintf (syscom, sizeof (syscom), "ls -FClg %s", arg);
       return (system (syscom));
     }

     int
     com_view (char *arg)
     {
       if (!valid_argument ("view", arg))
         return 1;

     #if defined (__MSDOS__)
       /* more.com doesn't grok slashes in pathnames */
       snprintf (syscom, sizeof (syscom), "less %s", arg);
     #else
       snprintf (syscom, sizeof (syscom), "more %s", arg);
     #endif
       return (system (syscom));
     }

     int
     com_rename (char *arg)
     {
       too_dangerous ("rename");
       return (1);
     }

     int
     com_stat (char *arg)
     {
       struct stat finfo;

       if (!valid_argument ("stat", arg))
         return (1);

       if (stat (arg, &finfo) == -1)
         {
           perror (arg);
           return (1);
         }

       printf ("Statistics for `%s':\n", arg);

       printf ("%s has %d link%s, and is %d byte%s in length.\n",
     	  arg,
               finfo.st_nlink,
               (finfo.st_nlink == 1) ? "" : "s",
               finfo.st_size,
               (finfo.st_size == 1) ? "" : "s");
       printf ("Inode Last Change at: %s", ctime (&finfo.st_ctime));
       printf ("      Last access at: %s", ctime (&finfo.st_atime));
       printf ("    Last modified at: %s", ctime (&finfo.st_mtime));
       return (0);
     }

     int
     com_delete (char *arg)
     {
       too_dangerous ("delete");
       return (1);
     }

     /* Print out help for ARG, or for all of the commands if ARG is
        not present. */
     int
     com_help (char *arg)
     {
       register int i;
       int printed = 0;

       for (i = 0; commands[i].name; i++)
         {
           if (!*arg || (strcmp (arg, commands[i].name) == 0))
             {
               printf ("%s\t\t%s.\n", commands[i].name, commands[i].doc);
               printed++;
             }
         }

       if (!printed)
         {
           printf ("No commands match `%s'.  Possibilities are:\n", arg);

           for (i = 0; commands[i].name; i++)
             {
               /* Print in six columns. */
               if (printed == 6)
                 {
                   printed = 0;
                   printf ("\n");
                 }

               printf ("%s\t", commands[i].name);
               printed++;
             }

           if (printed)
             printf ("\n");
         }
       return (0);
     }

     /* Change to the directory ARG. */
     int
     com_cd (char *arg)
     {
       if (chdir (arg) == -1)
         {
           perror (arg);
           return 1;
         }

       com_pwd ("");
       return (0);
     }

     /* Print out the current working directory. */
     int
     com_pwd (char *ignore)
     {
       char dir[1024], *s;

       s = getcwd (dir, sizeof(dir) - 1);
       if (s == 0)
         {
           printf ("Error getting pwd: %s\n", dir);
           return 1;
         }

       printf ("Current directory is %s\n", dir);
       return 0;
     }

     /* The user wishes to quit using this program.  Just set DONE non-zero. */
     int
     com_quit (char *arg)
     {
       done = 1;
       return (0);
     }

     /* Function which tells you that you can't do this. */
     void
     too_dangerous (char *caller)
     {
       fprintf (stderr,
                "%s: Too dangerous for me to distribute.  Write it yourself.\n",
                caller);
     }

     /* Return non-zero if ARG is a valid argument for CALLER, else print
        an error message and return zero. */
     int
     valid_argument (char *caller, char *arg)
     {
       if (!arg || !*arg)
         {
           fprintf (stderr, "%s: Argument required.\n", caller);
           return (0);
         }

       return (1);
     }


File: readline.info,  Node: GNU Free Documentation License,  Next: Concept Index,  Prev: Programming with GNU Readline,  Up: Top

Appendix A GNU Free Documentation License
*****************************************

                     Version 1.3, 3 November 2008

     Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
     <http://fsf.org/>

     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

  0. PREAMBLE

     The purpose of this License is to make a manual, textbook, or other
     functional and useful document “free” in the sense of freedom: to
     assure everyone the effective freedom to copy and redistribute it,
     with or without modifying it, either commercially or
     noncommercially.  Secondarily, this License preserves for the
     author and publisher a way to get credit for their work, while not
     being considered responsible for modifications made by others.

     This License is a kind of "copyleft", which means that derivative
     works of the document must themselves be free in the same sense.
     It complements the GNU General Public License, which is a copyleft
     license designed for free software.

     We have designed this License in order to use it for manuals for
     free software, because free software needs free documentation: a
     free program should come with manuals providing the same freedoms
     that the software does.  But this License is not limited to
     software manuals; it can be used for any textual work, regardless
     of subject matter or whether it is published as a printed book.  We
     recommend this License principally for works whose purpose is
     instruction or reference.

  1. APPLICABILITY AND DEFINITIONS

     This License applies to any manual or other work, in any medium,
     that contains a notice placed by the copyright holder saying it can
     be distributed under the terms of this License.  Such a notice
     grants a world-wide, royalty-free license, unlimited in duration,
     to use that work under the conditions stated herein.  The
     "Document", below, refers to any such manual or work.  Any member
     of the public is a licensee, and is addressed as "you".  You accept
     the license if you copy, modify or distribute the work in a way
     requiring permission under copyright law.

     A "Modified Version" of the Document means any work containing the
     Document or a portion of it, either copied verbatim, or with
     modifications and/or translated into another language.

     A "Secondary Section" is a named appendix or a front-matter section
     of the Document that deals exclusively with the relationship of the
     publishers or authors of the Document to the Document's overall
     subject (or to related matters) and contains nothing that could
     fall directly within that overall subject.  (Thus, if the Document
     is in part a textbook of mathematics, a Secondary Section may not
     explain any mathematics.)  The relationship could be a matter of
     historical connection with the subject or with related matters, or
     of legal, commercial, philosophical, ethical or political position
     regarding them.

     The "Invariant Sections" are certain Secondary Sections whose
     titles are designated, as being those of Invariant Sections, in the
     notice that says that the Document is released under this License.
     If a section does not fit the above definition of Secondary then it
     is not allowed to be designated as Invariant.  The Document may
     contain zero Invariant Sections.  If the Document does not identify
     any Invariant Sections then there are none.

     The "Cover Texts" are certain short passages of text that are
     listed, as Front-Cover Texts or Back-Cover Texts, in the notice
     that says that the Document is released under this License.  A
     Front-Cover Text may be at most 5 words, and a Back-Cover Text may
     be at most 25 words.

     A "Transparent" copy of the Document means a machine-readable copy,
     represented in a format whose specification is available to the
     general public, that is suitable for revising the document
     straightforwardly with generic text editors or (for images composed
     of pixels) generic paint programs or (for drawings) some widely
     available drawing editor, and that is suitable for input to text
     formatters or for automatic translation to a variety of formats
     suitable for input to text formatters.  A copy made in an otherwise
     Transparent file format whose markup, or absence of markup, has
     been arranged to thwart or discourage subsequent modification by
     readers is not Transparent.  An image format is not Transparent if
     used for any substantial amount of text.  A copy that is not
     "Transparent" is called "Opaque".

     Examples of suitable formats for Transparent copies include plain
     ASCII without markup, Texinfo input format, LaTeX input format,
     SGML or XML using a publicly available DTD, and standard-conforming
     simple HTML, PostScript or PDF designed for human modification.
     Examples of transparent image formats include PNG, XCF and JPG.
     Opaque formats include proprietary formats that can be read and
     edited only by proprietary word processors, SGML or XML for which
     the DTD and/or processing tools are not generally available, and
     the machine-generated HTML, PostScript or PDF produced by some word
     processors for output purposes only.

     The "Title Page" means, for a printed book, the title page itself,
     plus such following pages as are needed to hold, legibly, the
     material this License requires to appear in the title page.  For
     works in formats which do not have any title page as such, "Title
     Page" means the text near the most prominent appearance of the
     work's title, preceding the beginning of the body of the text.

     The "publisher" means any person or entity that distributes copies
     of the Document to the public.

     A section "Entitled XYZ" means a named subunit of the Document
     whose title either is precisely XYZ or contains XYZ in parentheses
     following text that translates XYZ in another language.  (Here XYZ
     stands for a specific section name mentioned below, such as
     "Acknowledgements", "Dedications", "Endorsements", or "History".)
     To "Preserve the Title" of such a section when you modify the
     Document means that it remains a section "Entitled XYZ" according
     to this definition.

     The Document may include Warranty Disclaimers next to the notice
     which states that this License applies to the Document.  These
     Warranty Disclaimers are considered to be included by reference in
     this License, but only as regards disclaiming warranties: any other
     implication that these Warranty Disclaimers may have is void and
     has no effect on the meaning of this License.

  2. VERBATIM COPYING

     You may copy and distribute the Document in any medium, either
     commercially or noncommercially, provided that this License, the
     copyright notices, and the license notice saying this License
     applies to the Document are reproduced in all copies, and that you
     add no other conditions whatsoever to those of this License.  You
     may not use technical measures to obstruct or control the reading
     or further copying of the copies you make or distribute.  However,
     you may accept compensation in exchange for copies.  If you
     distribute a large enough number of copies you must also follow the
     conditions in section 3.

     You may also lend copies, under the same conditions stated above,
     and you may publicly display copies.

  3. COPYING IN QUANTITY

     If you publish printed copies (or copies in media that commonly
     have printed covers) of the Document, numbering more than 100, and
     the Document's license notice requires Cover Texts, you must
     enclose the copies in covers that carry, clearly and legibly, all
     these Cover Texts: Front-Cover Texts on the front cover, and
     Back-Cover Texts on the back cover.  Both covers must also clearly
     and legibly identify you as the publisher of these copies.  The
     front cover must present the full title with all words of the title
     equally prominent and visible.  You may add other material on the
     covers in addition.  Copying with changes limited to the covers, as
     long as they preserve the title of the Document and satisfy these
     conditions, can be treated as verbatim copying in other respects.

     If the required texts for either cover are too voluminous to fit
     legibly, you should put the first ones listed (as many as fit
     reasonably) on the actual cover, and continue the rest onto
     adjacent pages.

     If you publish or distribute Opaque copies of the Document
     numbering more than 100, you must either include a machine-readable
     Transparent copy along with each Opaque copy, or state in or with
     each Opaque copy a computer-network location from which the general
     network-using public has access to download using public-standard
     network protocols a complete Transparent copy of the Document, free
     of added material.  If you use the latter option, you must take
     reasonably prudent steps, when you begin distribution of Opaque
     copies in quantity, to ensure that this Transparent copy will
     remain thus accessible at the stated location until at least one
     year after the last time you distribute an Opaque copy (directly or
     through your agents or retailers) of that edition to the public.

     It is requested, but not required, that you contact the authors of
     the Document well before redistributing any large number of copies,
     to give them a chance to provide you with an updated version of the
     Document.

  4. MODIFICATIONS

     You may copy and distribute a Modified Version of the Document
     under the conditions of sections 2 and 3 above, provided that you
     release the Modified Version under precisely this License, with the
     Modified Version filling the role of the Document, thus licensing
     distribution and modification of the Modified Version to whoever
     possesses a copy of it.  In addition, you must do these things in
     the Modified Version:

       A. Use in the Title Page (and on the covers, if any) a title
          distinct from that of the Document, and from those of previous
          versions (which should, if there were any, be listed in the
          History section of the Document).  You may use the same title
          as a previous version if the original publisher of that
          version gives permission.

       B. List on the Title Page, as authors, one or more persons or
          entities responsible for authorship of the modifications in
          the Modified Version, together with at least five of the
          principal authors of the Document (all of its principal
          authors, if it has fewer than five), unless they release you
          from this requirement.

       C. State on the Title page the name of the publisher of the
          Modified Version, as the publisher.

       D. Preserve all the copyright notices of the Document.

       E. Add an appropriate copyright notice for your modifications
          adjacent to the other copyright notices.

       F. Include, immediately after the copyright notices, a license
          notice giving the public permission to use the Modified
          Version under the terms of this License, in the form shown in
          the Addendum below.

       G. Preserve in that license notice the full lists of Invariant
          Sections and required Cover Texts given in the Document's
          license notice.

       H. Include an unaltered copy of this License.

       I. Preserve the section Entitled "History", Preserve its Title,
          and add to it an item stating at least the title, year, new
          authors, and publisher of the Modified Version as given on the
          Title Page.  If there is no section Entitled "History" in the
          Document, create one stating the title, year, authors, and
          publisher of the Document as given on its Title Page, then add
          an item describing the Modified Version as stated in the
          previous sentence.

       J. Preserve the network location, if any, given in the Document
          for public access to a Transparent copy of the Document, and
          likewise the network locations given in the Document for
          previous versions it was based on.  These may be placed in the
          "History" section.  You may omit a network location for a work
          that was published at least four years before the Document
          itself, or if the original publisher of the version it refers
          to gives permission.

       K. For any section Entitled "Acknowledgements" or "Dedications",
          Preserve the Title of the section, and preserve in the section
          all the substance and tone of each of the contributor
          acknowledgements and/or dedications given therein.

       L. Preserve all the Invariant Sections of the Document, unaltered
          in their text and in their titles.  Section numbers or the
          equivalent are not considered part of the section titles.

       M. Delete any section Entitled "Endorsements".  Such a section
          may not be included in the Modified Version.

       N. Do not retitle any existing section to be Entitled
          "Endorsements" or to conflict in title with any Invariant
          Section.

       O. Preserve any Warranty Disclaimers.

     If the Modified Version includes new front-matter sections or
     appendices that qualify as Secondary Sections and contain no
     material copied from the Document, you may at your option designate
     some or all of these sections as invariant.  To do this, add their
     titles to the list of Invariant Sections in the Modified Version's
     license notice.  These titles must be distinct from any other
     section titles.

     You may add a section Entitled "Endorsements", provided it contains
     nothing but endorsements of your Modified Version by various
     parties--for example, statements of peer review or that the text
     has been approved by an organization as the authoritative
     definition of a standard.

     You may add a passage of up to five words as a Front-Cover Text,
     and a passage of up to 25 words as a Back-Cover Text, to the end of
     the list of Cover Texts in the Modified Version.  Only one passage
     of Front-Cover Text and one of Back-Cover Text may be added by (or
     through arrangements made by) any one entity.  If the Document
     already includes a cover text for the same cover, previously added
     by you or by arrangement made by the same entity you are acting on
     behalf of, you may not add another; but you may replace the old
     one, on explicit permission from the previous publisher that added
     the old one.

     The author(s) and publisher(s) of the Document do not by this
     License give permission to use their names for publicity for or to
     assert or imply endorsement of any Modified Version.

  5. COMBINING DOCUMENTS

     You may combine the Document with other documents released under
     this License, under the terms defined in section 4 above for
     modified versions, provided that you include in the combination all
     of the Invariant Sections of all of the original documents,
     unmodified, and list them all as Invariant Sections of your
     combined work in its license notice, and that you preserve all
     their Warranty Disclaimers.

     The combined work need only contain one copy of this License, and
     multiple identical Invariant Sections may be replaced with a single
     copy.  If there are multiple Invariant Sections with the same name
     but different contents, make the title of each such section unique
     by adding at the end of it, in parentheses, the name of the
     original author or publisher of that section if known, or else a
     unique number.  Make the same adjustment to the section titles in
     the list of Invariant Sections in the license notice of the
     combined work.

     In the combination, you must combine any sections Entitled
     "History" in the various original documents, forming one section
     Entitled "History"; likewise combine any sections Entitled
     "Acknowledgements", and any sections Entitled "Dedications".  You
     must delete all sections Entitled "Endorsements."

  6. COLLECTIONS OF DOCUMENTS

     You may make a collection consisting of the Document and other
     documents released under this License, and replace the individual
     copies of this License in the various documents with a single copy
     that is included in the collection, provided that you follow the
     rules of this License for verbatim copying of each of the documents
     in all other respects.

     You may extract a single document from such a collection, and
     distribute it individually under this License, provided you insert
     a copy of this License into the extracted document, and follow this
     License in all other respects regarding verbatim copying of that
     document.

  7. AGGREGATION WITH INDEPENDENT WORKS

     A compilation of the Document or its derivatives with other
     separate and independent documents or works, in or on a volume of a
     storage or distribution medium, is called an "aggregate" if the
     copyright resulting from the compilation is not used to limit the
     legal rights of the compilation's users beyond what the individual
     works permit.  When the Document is included in an aggregate, this
     License does not apply to the other works in the aggregate which
     are not themselves derivative works of the Document.

     If the Cover Text requirement of section 3 is applicable to these
     copies of the Document, then if the Document is less than one half
     of the entire aggregate, the Document's Cover Texts may be placed
     on covers that bracket the Document within the aggregate, or the
     electronic equivalent of covers if the Document is in electronic
     form.  Otherwise they must appear on printed covers that bracket
     the whole aggregate.

  8. TRANSLATION

     Translation is considered a kind of modification, so you may
     distribute translations of the Document under the terms of section
     4.  Replacing Invariant Sections with translations requires special
     permission from their copyright holders, but you may include
     translations of some or all Invariant Sections in addition to the
     original versions of these Invariant Sections.  You may include a
     translation of this License, and all the license notices in the
     Document, and any Warranty Disclaimers, provided that you also
     include the original English version of this License and the
     original versions of those notices and disclaimers.  In case of a
     disagreement between the translation and the original version of
     this License or a notice or disclaimer, the original version will
     prevail.

     If a section in the Document is Entitled "Acknowledgements",
     "Dedications", or "History", the requirement (section 4) to
     Preserve its Title (section 1) will typically require changing the
     actual title.

  9. TERMINATION

     You may not copy, modify, sublicense, or distribute the Document
     except as expressly provided under this License.  Any attempt
     otherwise to copy, modify, sublicense, or distribute it is void,
     and will automatically terminate your rights under this License.

     However, if you cease all violation of this License, then your
     license from a particular copyright holder is reinstated (a)
     provisionally, unless and until the copyright holder explicitly and
     finally terminates your license, and (b) permanently, if the
     copyright holder fails to notify you of the violation by some
     reasonable means prior to 60 days after the cessation.

     Moreover, your license from a particular copyright holder is
     reinstated permanently if the copyright holder notifies you of the
     violation by some reasonable means, this is the first time you have
     received notice of violation of this License (for any work) from
     that copyright holder, and you cure the violation prior to 30 days
     after your receipt of the notice.

     Termination of your rights under this section does not terminate
     the licenses of parties who have received copies or rights from you
     under this License.  If your rights have been terminated and not
     permanently reinstated, receipt of a copy of some or all of the
     same material does not give you any rights to use it.

  10. FUTURE REVISIONS OF THIS LICENSE

     The Free Software Foundation may publish new, revised versions of
     the GNU Free Documentation License from time to time.  Such new
     versions will be similar in spirit to the present version, but may
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  11. RELICENSING

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ADDENDUM: How to use this License for your documents
====================================================

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the License in the document and put the following copyright and license
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       Copyright (C)  YEAR  YOUR NAME.
       Permission is granted to copy, distribute and/or modify this document
       under the terms of the GNU Free Documentation License, Version 1.3
       or any later version published by the Free Software Foundation;
       with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
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   If you have Invariant Sections, Front-Cover Texts and Back-Cover
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         with the Invariant Sections being LIST THEIR TITLES, with
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   If you have Invariant Sections without Cover Texts, or some other
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File: readline.info,  Node: Concept Index,  Next: Function and Variable Index,  Prev: GNU Free Documentation License,  Up: Top

Concept Index
*************

[index]
* Menu:

* application-specific completion functions: Custom Completers.
                                                               (line  6)
* command editing:                       Readline Bare Essentials.
                                                               (line  6)
* editing command lines:                 Readline Bare Essentials.
                                                               (line  6)
* initialization file, readline:         Readline Init File.   (line  6)
* interaction, readline:                 Readline Interaction. (line  6)
* kill ring:                             Readline Killing Commands.
                                                               (line 18)
* killing text:                          Readline Killing Commands.
                                                               (line  6)
* notation, readline:                    Readline Bare Essentials.
                                                               (line  6)
* readline, function:                    Basic Behavior.       (line 11)
* variables, readline:                   Readline Init File Syntax.
                                                               (line 34)
* yanking text:                          Readline Killing Commands.
                                                               (line  6)


File: readline.info,  Node: Function and Variable Index,  Prev: Concept Index,  Up: Top

Function and Variable Index
***************************

[index]
* Menu:

* _rl_digit_p:                           Utility Functions.   (line  59)
* _rl_digit_value:                       Utility Functions.   (line  70)
* _rl_lowercase_p:                       Utility Functions.   (line  56)
* _rl_to_lower:                          Utility Functions.   (line  66)
* _rl_to_upper:                          Utility Functions.   (line  62)
* _rl_uppercase_p:                       Utility Functions.   (line  53)
* abort (C-g):                           Miscellaneous Commands.
                                                              (line  10)
* accept-line (Newline or Return):       Commands For History.
                                                              (line   6)
* active-region-end-color:               Readline Init File Syntax.
                                                              (line  48)
* active-region-start-color:             Readline Init File Syntax.
                                                              (line  35)
* backward-char (C-b):                   Commands For Moving. (line  18)
* backward-delete-char (Rubout):         Commands For Text.   (line  18)
* backward-kill-line (C-x Rubout):       Commands For Killing.
                                                              (line  11)
* backward-kill-word (M-<DEL>):          Commands For Killing.
                                                              (line  28)
* backward-word (M-b):                   Commands For Moving. (line  26)
* beginning-of-history (M-<):            Commands For History.
                                                              (line  21)
* beginning-of-line (C-a):               Commands For Moving. (line   6)
* bell-style:                            Readline Init File Syntax.
                                                              (line  61)
* bind-tty-special-chars:                Readline Init File Syntax.
                                                              (line  68)
* blink-matching-paren:                  Readline Init File Syntax.
                                                              (line  76)
* bracketed-paste-begin ():              Commands For Text.   (line  38)
* call-last-kbd-macro (C-x e):           Keyboard Macros.     (line  13)
* capitalize-word (M-c):                 Commands For Text.   (line  69)
* character-search (C-]):                Miscellaneous Commands.
                                                              (line  41)
* character-search-backward (M-C-]):     Miscellaneous Commands.
                                                              (line  45)
* clear-display (M-C-l):                 Commands For Moving. (line  44)
* clear-screen (C-l):                    Commands For Moving. (line  49)
* colored-completion-prefix:             Readline Init File Syntax.
                                                              (line  81)
* colored-stats:                         Readline Init File Syntax.
                                                              (line  91)
* comment-begin:                         Readline Init File Syntax.
                                                              (line  97)
* complete (<TAB>):                      Commands For Completion.
                                                              (line   6)
* completion-display-width:              Readline Init File Syntax.
                                                              (line 101)
* completion-ignore-case:                Readline Init File Syntax.
                                                              (line 108)
* completion-map-case:                   Readline Init File Syntax.
                                                              (line 113)
* completion-prefix-display-length:      Readline Init File Syntax.
                                                              (line 119)
* completion-query-items:                Readline Init File Syntax.
                                                              (line 128)
* convert-meta:                          Readline Init File Syntax.
                                                              (line 139)
* copy-backward-word ():                 Commands For Killing.
                                                              (line  53)
* copy-forward-word ():                  Commands For Killing.
                                                              (line  58)
* copy-region-as-kill ():                Commands For Killing.
                                                              (line  49)
* delete-char (C-d):                     Commands For Text.   (line  12)
* delete-char-or-list ():                Commands For Completion.
                                                              (line  62)
* delete-horizontal-space ():            Commands For Killing.
                                                              (line  41)
* digit-argument (M-0, M-1, ... M--):    Numeric Arguments.   (line   6)
* disable-completion:                    Readline Init File Syntax.
                                                              (line 151)
* do-lowercase-version (M-A, M-B, M-X, ...): Miscellaneous Commands.
                                                              (line  14)
* downcase-word (M-l):                   Commands For Text.   (line  65)
* dump-functions ():                     Miscellaneous Commands.
                                                              (line  68)
* dump-macros ():                        Miscellaneous Commands.
                                                              (line  80)
* dump-variables ():                     Miscellaneous Commands.
                                                              (line  74)
* echo-control-characters:               Readline Init File Syntax.
                                                              (line 156)
* editing-mode:                          Readline Init File Syntax.
                                                              (line 161)
* emacs-editing-mode (C-e):              Miscellaneous Commands.
                                                              (line  94)
* emacs-mode-string:                     Readline Init File Syntax.
                                                              (line 167)
* enable-active-region The:              Readline Init File Syntax.
                                                              (line 177)
* enable-bracketed-paste:                Readline Init File Syntax.
                                                              (line 190)
* enable-keypad:                         Readline Init File Syntax.
                                                              (line 199)
* enable-meta-key:                       Readline Init File Syntax.
                                                              (line 204)
* end-kbd-macro (C-x )):                 Keyboard Macros.     (line   9)
* end-of-file (usually C-d):             Commands For Text.   (line   6)
* end-of-history (M->):                  Commands For History.
                                                              (line  24)
* end-of-line (C-e):                     Commands For Moving. (line  10)
* exchange-point-and-mark (C-x C-x):     Miscellaneous Commands.
                                                              (line  37)
* execute-named-command (M-x):           Miscellaneous Commands.
                                                              (line  87)
* expand-tilde:                          Readline Init File Syntax.
                                                              (line 214)
* export-completions ():                 Commands For Completion.
                                                              (line  38)
* fetch-history ():                      Commands For History.
                                                              (line 107)
* force-meta-prefix:                     Readline Init File Syntax.
                                                              (line 218)
* forward-backward-delete-char ():       Commands For Text.   (line  23)
* forward-char (C-f):                    Commands For Moving. (line  14)
* forward-search-history (C-s):          Commands For History.
                                                              (line  34)
* forward-word (M-f):                    Commands For Moving. (line  22)
* history-preserve-point:                Readline Init File Syntax.
                                                              (line 231)
* history-search-backward ():            Commands For History.
                                                              (line  52)
* history-search-forward ():             Commands For History.
                                                              (line  59)
* history-size:                          Readline Init File Syntax.
                                                              (line 237)
* history-substring-search-backward ():  Commands For History.
                                                              (line  66)
* history-substring-search-forward ():   Commands For History.
                                                              (line  72)
* horizontal-scroll-mode:                Readline Init File Syntax.
                                                              (line 246)
* input-meta:                            Readline Init File Syntax.
                                                              (line 254)
* insert-comment (M-#):                  Miscellaneous Commands.
                                                              (line  59)
* insert-completions (M-*):              Commands For Completion.
                                                              (line  18)
* isearch-terminators:                   Readline Init File Syntax.
                                                              (line 265)
* keymap:                                Readline Init File Syntax.
                                                              (line 272)
* kill-line (C-k):                       Commands For Killing.
                                                              (line   6)
* kill-region ():                        Commands For Killing.
                                                              (line  45)
* kill-whole-line ():                    Commands For Killing.
                                                              (line  19)
* kill-word (M-d):                       Commands For Killing.
                                                              (line  23)
* mark-modified-lines:                   Readline Init File Syntax.
                                                              (line 302)
* mark-symlinked-directories:            Readline Init File Syntax.
                                                              (line 307)
* match-hidden-files:                    Readline Init File Syntax.
                                                              (line 312)
* menu-complete ():                      Commands For Completion.
                                                              (line  22)
* menu-complete-backward ():             Commands For Completion.
                                                              (line  33)
* menu-complete-display-prefix:          Readline Init File Syntax.
                                                              (line 319)
* meta-flag:                             Readline Init File Syntax.
                                                              (line 254)
* next-history (C-n):                    Commands For History.
                                                              (line  17)
* next-screen-line ():                   Commands For Moving. (line  37)
* non-incremental-forward-search-history (M-n): Commands For History.
                                                              (line  46)
* non-incremental-reverse-search-history (M-p): Commands For History.
                                                              (line  40)
* operate-and-get-next (C-o):            Commands For History.
                                                              (line 100)
* output-meta:                           Readline Init File Syntax.
                                                              (line 324)
* overwrite-mode ():                     Commands For Text.   (line  73)
* page-completions:                      Readline Init File Syntax.
                                                              (line 333)
* possible-completions (M-?):            Commands For Completion.
                                                              (line  11)
* prefix-meta (<ESC>):                   Miscellaneous Commands.
                                                              (line  19)
* previous-history (C-p):                Commands For History.
                                                              (line  12)
* previous-screen-line ():               Commands For Moving. (line  30)
* print-last-kbd-macro ():               Keyboard Macros.     (line  17)
* quoted-insert (C-q or C-v):            Commands For Text.   (line  28)
* re-read-init-file (C-x C-r):           Miscellaneous Commands.
                                                              (line   6)
* readline:                              Basic Behavior.      (line  11)
* redraw-current-line ():                Commands For Moving. (line  54)
* reverse-search-history (C-r):          Commands For History.
                                                              (line  28)
* revert-all-at-newline:                 Readline Init File Syntax.
                                                              (line 346)
* revert-line (M-r):                     Miscellaneous Commands.
                                                              (line  26)
* rl_activate_mark:                      Miscellaneous Functions.
                                                              (line  62)
* rl_add_defun:                          Function Naming.     (line  19)
* rl_add_funmap_entry:                   Associating Function Names and Bindings.
                                                              (line  70)
* rl_add_undo:                           Allowing Undoing.    (line  40)
* rl_alphabetic:                         Utility Functions.   (line  33)
* rl_already_prompted:                   Readline Variables.  (line  74)
* rl_attempted_completion_function:      Completion Variables.
                                                              (line  11)
* rl_attempted_completion_over:          Completion Variables.
                                                              (line 291)
* rl_basic_quote_characters:             Completion Variables.
                                                              (line 165)
* rl_basic_word_break_characters:        Completion Variables.
                                                              (line 159)
* rl_begin_undo_group:                   Allowing Undoing.    (line  29)
* rl_bind_key:                           Binding Keys.        (line  21)
* rl_bind_key_if_unbound:                Binding Keys.        (line  30)
* rl_bind_key_if_unbound_in_map:         Binding Keys.        (line  36)
* rl_bind_key_in_map:                    Binding Keys.        (line  25)
* rl_bind_keyseq:                        Binding Keys.        (line  58)
* rl_bind_keyseq_if_unbound:             Binding Keys.        (line  76)
* rl_bind_keyseq_if_unbound_in_map:      Binding Keys.        (line  82)
* rl_bind_keyseq_in_map:                 Binding Keys.        (line  65)
* rl_binding_keymap:                     Readline Variables.  (line 211)
* rl_callback_handler_install:           Alternate Interface. (line  14)
* rl_callback_handler_remove:            Alternate Interface. (line  44)
* rl_callback_read_char:                 Alternate Interface. (line  23)
* rl_callback_sigcleanup:                Alternate Interface. (line  37)
* rl_catch_signals:                      Readline Signal Handling.
                                                              (line  69)
* rl_catch_sigwinch:                     Readline Signal Handling.
                                                              (line  76)
* rl_change_environment:                 Readline Signal Handling.
                                                              (line  90)
* rl_char_is_quoted_p:                   Completion Variables.
                                                              (line  48)
* rl_check_signals:                      Readline Signal Handling.
                                                              (line 133)
* rl_cleanup_after_signal:               Readline Signal Handling.
                                                              (line 107)
* rl_clear_history:                      Miscellaneous Functions.
                                                              (line  56)
* rl_clear_message:                      Redisplay.           (line  51)
* rl_clear_pending_input:                Character Input.     (line  29)
* rl_clear_signals:                      Readline Signal Handling.
                                                              (line 182)
* rl_clear_visible_line:                 Redisplay.           (line  25)
* rl_complete:                           How Completing Works.
                                                              (line  46)
* rl_complete <1>:                       Completion Functions.
                                                              (line  19)
* rl_complete_internal:                  Completion Functions.
                                                              (line   9)
* rl_completer_quote_characters:         Completion Variables.
                                                              (line 184)
* rl_completer_word_break_characters:    Completion Variables.
                                                              (line 169)
* rl_completion_append_character:        Completion Variables.
                                                              (line 210)
* rl_completion_display_matches_hook:    Completion Variables.
                                                              (line 146)
* rl_completion_entry_function:          How Completing Works.
                                                              (line  52)
* rl_completion_entry_function <1>:      Completion Variables.
                                                              (line   6)
* rl_completion_found_quote:             Completion Variables.
                                                              (line 235)
* rl_completion_invoking_key:            Completion Variables.
                                                              (line 314)
* rl_completion_mark_symlink_dirs:       Completion Variables.
                                                              (line 247)
* rl_completion_matches:                 Completion Functions.
                                                              (line  43)
* rl_completion_mode:                    Completion Functions.
                                                              (line  36)
* rl_completion_query_items:             Completion Variables.
                                                              (line 202)
* rl_completion_quote_character:         Completion Variables.
                                                              (line 241)
* rl_completion_rewrite_hook:            Completion Variables.
                                                              (line 128)
* rl_completion_suppress_append:         Completion Variables.
                                                              (line 222)
* rl_completion_suppress_quote:          Completion Variables.
                                                              (line 229)
* rl_completion_type:                    Completion Variables.
                                                              (line 306)
* rl_completion_word_break_hook:         Completion Variables.
                                                              (line 175)
* rl_copy_keymap:                        Keymaps.             (line  16)
* rl_copy_text:                          Modifying Text.      (line  14)
* rl_crlf:                               Redisplay.           (line  33)
* rl_deactivate_mark:                    Miscellaneous Functions.
                                                              (line  70)
* rl_delete_text:                        Modifying Text.      (line  10)
* rl_deprep_term_function:               Readline Variables.  (line 193)
* rl_deprep_terminal:                    Terminal Management. (line  12)
* rl_ding:                               Utility Functions.   (line  30)
* rl_directory_completion_hook:          Completion Variables.
                                                              (line  65)
* rl_directory_rewrite_hook;:            Completion Variables.
                                                              (line  83)
* rl_discard_keymap:                     Keymaps.             (line  25)
* rl_dispatching:                        Readline Variables.  (line  49)
* rl_display_match_list:                 Utility Functions.   (line  36)
* rl_display_prompt:                     Readline Variables.  (line  69)
* rl_do_undo:                            Allowing Undoing.    (line  48)
* rl_done:                               Readline Variables.  (line  28)
* rl_echo_signal_char:                   Readline Signal Handling.
                                                              (line 143)
* rl_editing_mode:                       Readline Variables.  (line 318)
* rl_empty_keymap:                       Keymaps.             (line  33)
* rl_end:                                Readline Variables.  (line  18)
* rl_end_undo_group:                     Allowing Undoing.    (line  35)
* rl_eof_found:                          Readline Variables.  (line  34)
* rl_erase_empty_line:                   Readline Variables.  (line  55)
* rl_event_hook:                         Readline Variables.  (line 137)
* rl_execute_next:                       Character Input.     (line  25)
* rl_executing_key:                      Readline Variables.  (line 218)
* rl_executing_keymap:                   Readline Variables.  (line 207)
* rl_executing_keyseq:                   Readline Variables.  (line 222)
* rl_executing_macro:                    Readline Variables.  (line 215)
* rl_expand_prompt:                      Redisplay.           (line  66)
* rl_explicit_arg:                       Readline Variables.  (line 308)
* rl_extend_line_buffer:                 Utility Functions.   (line  21)
* rl_filename_completion_desired:        Completion Variables.
                                                              (line 262)
* rl_filename_completion_function:       Completion Functions.
                                                              (line  57)
* rl_filename_dequoting_function:        Completion Variables.
                                                              (line  39)
* rl_filename_quote_characters:          Completion Variables.
                                                              (line 190)
* rl_filename_quoting_desired:           Completion Variables.
                                                              (line 272)
* rl_filename_quoting_function:          Completion Variables.
                                                              (line  24)
* rl_filename_rewrite_hook:              Completion Variables.
                                                              (line 111)
* rl_filename_stat_hook:                 Completion Variables.
                                                              (line  99)
* rl_forced_update_display:              Redisplay.           (line  10)
* rl_free:                               Utility Functions.   (line  17)
* rl_free_keymap:                        Keymaps.             (line  29)
* rl_free_line_state:                    Readline Signal Handling.
                                                              (line 113)
* rl_free_undo_list:                     Allowing Undoing.    (line  45)
* rl_full_quoting_desired:               Completion Variables.
                                                              (line 282)
* rl_function_dumper:                    Associating Function Names and Bindings.
                                                              (line  54)
* rl_function_of_keyseq:                 Associating Function Names and Bindings.
                                                              (line  14)
* rl_function_of_keyseq_len:             Associating Function Names and Bindings.
                                                              (line  23)
* rl_funmap_names:                       Associating Function Names and Bindings.
                                                              (line  64)
* rl_generic_bind:                       Binding Keys.        (line  88)
* rl_get_keymap:                         Keymaps.             (line  41)
* rl_get_keymap_by_name:                 Keymaps.             (line  47)
* rl_get_keymap_name:                    Keymaps.             (line  52)
* rl_get_screen_size:                    Readline Signal Handling.
                                                              (line 165)
* rl_get_termcap:                        Miscellaneous Functions.
                                                              (line  44)
* rl_getc:                               Character Input.     (line  14)
* rl_getc_function:                      Readline Variables.  (line 142)
* rl_gnu_readline_p:                     Readline Variables.  (line  94)
* rl_ignore_completion_duplicates:       Completion Variables.
                                                              (line 258)
* rl_ignore_some_completions_function:   Completion Variables.
                                                              (line  57)
* rl_inhibit_completion:                 Completion Variables.
                                                              (line 320)
* rl_initialize:                         Utility Functions.   (line  25)
* rl_input_available_hook:               Readline Variables.  (line 158)
* rl_insert_completions:                 Completion Functions.
                                                              (line  31)
* rl_insert_text:                        Modifying Text.      (line   6)
* rl_instream:                           Readline Variables.  (line 110)
* rl_invoking_keyseqs:                   Associating Function Names and Bindings.
                                                              (line  38)
* rl_invoking_keyseqs_in_map:            Associating Function Names and Bindings.
                                                              (line  42)
* rl_keep_mark_active:                   Miscellaneous Functions.
                                                              (line  73)
* rl_key_sequence_length:                Readline Variables.  (line 226)
* rl_kill_text:                          Modifying Text.      (line  18)
* rl_last_func:                          Readline Variables.  (line 123)
* rl_library_version:                    Readline Variables.  (line  83)
* rl_line_buffer:                        Readline Variables.  (line   8)
* rl_list_funmap_names:                  Associating Function Names and Bindings.
                                                              (line  60)
* rl_macro_bind:                         Miscellaneous Functions.
                                                              (line   6)
* rl_macro_display_hook:                 Readline Variables.  (line 199)
* rl_macro_dumper:                       Miscellaneous Functions.
                                                              (line  13)
* rl_make_bare_keymap:                   Keymaps.             (line  11)
* rl_make_keymap:                        Keymaps.             (line  19)
* rl_mark:                               Readline Variables.  (line  23)
* rl_mark_active_p:                      Miscellaneous Functions.
                                                              (line  79)
* rl_message:                            Redisplay.           (line  42)
* rl_modifying:                          Allowing Undoing.    (line  58)
* rl_named_function:                     Associating Function Names and Bindings.
                                                              (line  10)
* rl_num_chars_to_read:                  Readline Variables.  (line  40)
* rl_numeric_arg:                        Readline Variables.  (line 313)
* rl_on_new_line:                        Redisplay.           (line  14)
* rl_on_new_line_with_prompt:            Redisplay.           (line  18)
* rl_outstream:                          Readline Variables.  (line 114)
* rl_parse_and_bind:                     Binding Keys.        (line  97)
* rl_pending_input:                      Readline Variables.  (line  45)
* rl_pending_signal:                     Readline Signal Handling.
                                                              (line 102)
* rl_persistent_signal_handlers:         Readline Signal Handling.
                                                              (line  82)
* rl_point:                              Readline Variables.  (line  14)
* rl_possible_completions:               Completion Functions.
                                                              (line  27)
* rl_pre_input_hook:                     Readline Variables.  (line 132)
* rl_prefer_env_winsize:                 Readline Variables.  (line 118)
* rl_prep_term_function:                 Readline Variables.  (line 186)
* rl_prep_terminal:                      Terminal Management. (line   6)
* rl_print_keybinding:                   Associating Function Names and Bindings.
                                                              (line  47)
* rl_prompt:                             Readline Variables.  (line  61)
* rl_push_macro_input:                   Modifying Text.      (line  30)
* rl_read_init_file:                     Binding Keys.        (line 102)
* rl_read_key:                           Character Input.     (line   6)
* rl_readline_name:                      Readline Variables.  (line 105)
* rl_readline_state:                     Readline Variables.  (line 229)
* rl_readline_version:                   Readline Variables.  (line  87)
* rl_redisplay:                          Redisplay.           (line   6)
* rl_redisplay_function:                 Readline Variables.  (line 180)
* rl_reparse_colors:                     Miscellaneous Functions.
                                                              (line  53)
* rl_replace_line:                       Modifying Text.      (line  25)
* rl_reset_after_signal:                 Readline Signal Handling.
                                                              (line 121)
* rl_reset_line_state:                   Redisplay.           (line  29)
* rl_reset_screen_size:                  Readline Signal Handling.
                                                              (line 169)
* rl_reset_terminal:                     Terminal Management. (line  34)
* rl_resize_terminal:                    Readline Signal Handling.
                                                              (line 149)
* rl_restore_prompt:                     Redisplay.           (line  60)
* rl_restore_state:                      Utility Functions.   (line  11)
* rl_save_prompt:                        Redisplay.           (line  56)
* rl_save_state:                         Utility Functions.   (line   6)
* rl_set_key:                            Binding Keys.        (line  72)
* rl_set_keyboard_input_timeout:         Character Input.     (line  34)
* rl_set_keymap:                         Keymaps.             (line  44)
* rl_set_keymap_name:                    Keymaps.             (line  57)
* rl_set_paren_blink_timeout:            Miscellaneous Functions.
                                                              (line  39)
* rl_set_prompt:                         Redisplay.           (line  82)
* rl_set_screen_size:                    Readline Signal Handling.
                                                              (line 153)
* rl_set_signals:                        Readline Signal Handling.
                                                              (line 176)
* rl_set_timeout:                        Character Input.     (line  42)
* rl_show_char:                          Redisplay.           (line  36)
* rl_signal_event_hook:                  Readline Variables.  (line 149)
* rl_sort_completion_matches:            Completion Variables.
                                                              (line 298)
* rl_special_prefixes:                   Completion Variables.
                                                              (line 195)
* rl_startup_hook:                       Readline Variables.  (line 128)
* rl_stuff_char:                         Character Input.     (line  18)
* rl_terminal_name:                      Readline Variables.  (line  98)
* rl_timeout_event_hook:                 Readline Variables.  (line 154)
* rl_timeout_remaining:                  Character Input.     (line  52)
* rl_trim_arg_from_keyseq:               Associating Function Names and Bindings.
                                                              (line  30)
* rl_tty_set_default_bindings:           Terminal Management. (line  17)
* rl_tty_set_echoing:                    Terminal Management. (line  27)
* rl_tty_unset_default_bindings:         Terminal Management. (line  22)
* rl_unbind_command_in_map:              Binding Keys.        (line  54)
* rl_unbind_function_in_map:             Binding Keys.        (line  50)
* rl_unbind_key:                         Binding Keys.        (line  41)
* rl_unbind_key_in_map:                  Binding Keys.        (line  46)
* rl_username_completion_function:       Completion Functions.
                                                              (line  64)
* rl_variable_bind:                      Miscellaneous Functions.
                                                              (line  21)
* rl_variable_dumper:                    Miscellaneous Functions.
                                                              (line  33)
* rl_variable_value:                     Miscellaneous Functions.
                                                              (line  28)
* search-ignore-case:                    Readline Init File Syntax.
                                                              (line 353)
* self-insert (a, b, A, 1, !, ...):      Commands For Text.   (line  35)
* set-mark (C-@):                        Miscellaneous Commands.
                                                              (line  33)
* show-all-if-ambiguous:                 Readline Init File Syntax.
                                                              (line 358)
* show-all-if-unmodified:                Readline Init File Syntax.
                                                              (line 364)
* show-mode-in-prompt:                   Readline Init File Syntax.
                                                              (line 373)
* skip-completed-text:                   Readline Init File Syntax.
                                                              (line 379)
* skip-csi-sequence ():                  Miscellaneous Commands.
                                                              (line  50)
* start-kbd-macro (C-x ():               Keyboard Macros.     (line   6)
* tab-insert (M-<TAB>):                  Commands For Text.   (line  32)
* tilde-expand (M-~):                    Miscellaneous Commands.
                                                              (line  30)
* transpose-chars (C-t):                 Commands For Text.   (line  50)
* transpose-words (M-t):                 Commands For Text.   (line  56)
* undo (C-_ or C-x C-u):                 Miscellaneous Commands.
                                                              (line  23)
* universal-argument ():                 Numeric Arguments.   (line  10)
* unix-filename-rubout ():               Commands For Killing.
                                                              (line  36)
* unix-line-discard (C-u):               Commands For Killing.
                                                              (line  16)
* unix-word-rubout (C-w):                Commands For Killing.
                                                              (line  32)
* upcase-word (M-u):                     Commands For Text.   (line  61)
* vi-cmd-mode-string:                    Readline Init File Syntax.
                                                              (line 392)
* vi-editing-mode (M-C-j):               Miscellaneous Commands.
                                                              (line  98)
* vi-ins-mode-string:                    Readline Init File Syntax.
                                                              (line 403)
* visible-stats:                         Readline Init File Syntax.
                                                              (line 414)
* yank (C-y):                            Commands For Killing.
                                                              (line  63)
* yank-last-arg (M-. or M-_):            Commands For History.
                                                              (line  88)
* yank-nth-arg (M-C-y):                  Commands For History.
                                                              (line  78)
* yank-pop (M-y):                        Commands For Killing.
                                                              (line  66)



Tag Table:
Node: Top864
Node: Command Line Editing1589
Node: Introduction and Notation2241
Node: Readline Interaction4597
Node: Readline Bare Essentials5789
Node: Readline Movement Commands7601
Node: Readline Killing Commands8601
Node: Readline Arguments10628
Node: Searching11689
Node: Readline Init File13902
Node: Readline Init File Syntax15099
Node: Conditional Init Constructs41573
Node: Sample Init File45962
Node: Bindable Readline Commands49086
Node: Commands For Moving50470
Node: Commands For History52637
Node: Commands For Text57979
Node: Commands For Killing61824
Node: Numeric Arguments64280
Node: Commands For Completion65436
Node: Keyboard Macros68719
Node: Miscellaneous Commands69424
Node: Readline vi Mode73755
Node: Programming with GNU Readline75652
Node: Basic Behavior76638
Node: Custom Functions80699
Node: Readline Typedefs82221
Node: Function Writing84107
Node: Readline Variables85413
Node: Readline Convenience Functions100367
Node: Function Naming101443
Node: Keymaps102774
Node: Binding Keys105935
Node: Associating Function Names and Bindings110760
Node: Allowing Undoing114590
Node: Redisplay117340
Node: Modifying Text121642
Node: Character Input123181
Node: Terminal Management126338
Node: Utility Functions128225
Node: Miscellaneous Functions131335
Node: Alternate Interface135225
Node: A Readline Example138120
Node: Alternate Interface Example140038
Node: Readline Signal Handling143657
Node: Custom Completers153207
Node: How Completing Works153927
Node: Completion Functions157303
Node: Completion Variables160970
Node: A Short Completion Example179288
Node: GNU Free Documentation License191957
Node: Concept Index217134
Node: Function and Variable Index218655

End Tag Table


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