freebsd-dev/gnu/lib/libreadline/doc/rluser.texinfo

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@ignore
This file documents the end user interface to the GNU command line
editing features.  It is to be an appendix to manuals for programs which
use these features.  There is a document entitled "readline.texinfo"
which contains both end-user and programmer documentation for the GNU
Readline Library.

Copyright (C) 1988 Free Software Foundation, Inc.

Authored by Brian Fox and Chet Ramey.

Permission is granted to process this file through Tex and print the
results, provided the printed document carries copying permission notice
identical to this one except for the removal of this paragraph (this
paragraph not being relevant to the printed manual).

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

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided also that the
GNU Copyright statement is available to the distributee, and 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.
@end ignore

@comment If you are including this manual as an appendix, then set the
@comment variable readline-appendix.

@node Command Line Editing
@chapter 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.
@end menu

@node Introduction and Notation
@section Introduction to Line Editing

The following paragraphs describe the notation used to represent
keystrokes.

The text @key{C-k} is read as `Control-K' and describes the character
produced when the Control key is depressed and the @key{k} key is struck.

The text @key{M-k} is read as `Meta-K' and describes the character
produced when the meta key (if you have one) is depressed, and the @key{k}
key is struck.  If you do not have a meta key, the identical keystroke
can be generated by typing @key{ESC} @i{first}, and then typing @key{k}.
Either process is known as @dfn{metafying} the @key{k} key.

The text @key{M-C-k} is read as `Meta-Control-k' and describes the
character produced by @dfn{metafying} @key{C-k}.

In addition, several keys have their own names.  Specifically,
@key{DEL}, @key{ESC}, @key{LFD}, @key{SPC}, @key{RET}, and @key{TAB} all
stand for themselves when seen in this text, or in an init file
(@pxref{Readline Init File}, for more info).

@node Readline Interaction
@section Readline Interaction
@cindex interaction, readline

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 @key{RETURN}.  You do not have to be at the
end of the line to press @key{RETURN}; 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.
@end menu

@node Readline Bare Essentials
@subsection 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 miss typing a character that you wanted to type, and
not notice your error until you have typed several other characters.  In
that case, you can type @key{C-b} to move the cursor to the left, and then
correct your mistake.  Afterwards, you can move the cursor to the right
with @key{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.  A list of the basic bare
essentials for editing the text of an input line follows.

@table @asis
@item @key{C-b}
Move back one character.
@item @key{C-f}
Move forward one character.
@item @key{DEL}
Delete the character to the left of the cursor.
@item @key{C-d}
Delete the character underneath the cursor.
@item @w{Printing characters}
Insert the character into the line at the cursor.
@item @key{C-_}
Undo the last thing that you did.  You can undo all the way back to an
empty line.
@end table

@node Readline Movement Commands
@subsection Readline Movement Commands


The above table describes the most basic possible keystrokes that you need
in order to do editing of the input line.  For your convenience, many
other commands have been added in addition to @key{C-b}, @key{C-f},
@key{C-d}, and @key{DEL}.  Here are some commands for moving more rapidly
about the line.

@table @key
@item C-a
Move to the start of the line.
@item C-e
Move to the end of the line.
@item M-f
Move forward a word.
@item M-b
Move backward a word.
@item C-l
Clear the screen, reprinting the current line at the top.
@end table

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

@node Readline Killing Commands
@subsection Readline Killing Commands

@cindex Killing text
@cindex Yanking text

@dfn{Killing} text means to delete the text from the line, but to save
it away for later use, usually by @dfn{yanking} (re-inserting)
it back into the line.
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 @dfn{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.
@cindex Kill ring

Here is the list of commands for killing text.

@table @key
@item C-k
Kill the text from the current cursor position to the end of the line.

@item M-d
Kill from the cursor to the end of the current word, or if between
words, to the end of the next word.

@item M-DEL
Kill from the cursor the start of the previous word, or if between
words, to the start of the previous word.

@item C-w
Kill from the cursor to the previous whitespace.  This is different than
@key{M-DEL} because the word boundaries differ.

@end table

And, here is how to @dfn{yank} the text back into the line.  Yanking
means to copy the most-recently-killed text from the kill buffer.

@table @key
@item C-y
Yank the most recently killed text back into the buffer at the cursor.

@item M-y
Rotate the kill-ring, and yank the new top.  You can only do this if
the prior command is @key{C-y} or @key{M-y}.
@end table

@node Readline Arguments
@subsection Readline Arguments

You can pass numeric arguments to Readline commands.  Sometimes the
argument acts as a repeat count, other times it is the @i{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 @key{M--} @key{C-k}.

The general way to pass numeric arguments to a command is to type meta
digits before the command.  If the first `digit' you type is a minus
sign (@key{-}), 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 @key{C-d} command an argument of 10, you could type @key{M-1 0 C-d}.


@node Readline Init File
@section Readline Init File

Although the Readline library comes with a set of Emacs-like
keybindings installed by default,
it is possible that you would like to use a different set
of keybindings.  You can customize programs that use Readline by putting
commands in an @dfn{init} file in your home directory.  The name of this
@ifset BashFeatures
file is taken from the value of the shell variable @code{INPUTRC}.  If
@end ifset
@ifclear BashFeatures
file is taken from the value of the environment variable @code{INPUTRC}.  If
@end ifclear
that variable is unset, the default is @file{~/.inputrc}.

When a program which uses the Readline library starts up, the
init file is read, and the key bindings are set.

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

@menu
* Readline Init Syntax::	Syntax for the commands in the inputrc file.
* Conditional Init Constructs::	Conditional key bindings in the inputrc file.
@end menu

@node Readline Init Syntax
@subsection Readline Init Syntax

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

@table @asis
@item Variable Settings
You can change the state of a few variables in Readline by
using the @code{set} command within the init file.  Here is how you
would specify that you wish to use @code{vi} line editing commands:

@example
set editing-mode vi
@end example

Right now, there are only a few variables which can be set;
so few, in fact, that we just list them here:

@table @code

@item editing-mode
@vindex editing-mode
The @code{editing-mode} variable controls which editing mode you are
using.  By default, Readline starts up in Emacs editing mode, where
the keystrokes are most similar to Emacs.  This variable can be
set to either @code{emacs} or @code{vi}.

@item horizontal-scroll-mode
@vindex horizontal-scroll-mode
This variable can be set to either @code{On} or @code{Off}.  Setting it
to @code{On} means that the text of the lines that you edit will scroll
horizontally on a single screen line when they are longer than the width
of the screen, instead of wrapping onto a new screen line.  By default,
this variable is set to @code{Off}.

@item mark-modified-lines
@vindex mark-modified-lines
This variable, when set to @code{On}, says to display an asterisk
(@samp{*}) at the start of history lines which have been modified.
This variable is @code{off} by default.

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

@item comment-begin
@vindex comment-begin
The string to insert at the beginning of the line when the
@code{vi-comment} command is executed.  The default value
is @code{"#"}.

@item meta-flag
@vindex meta-flag
If set to @code{on}, Readline will enable eight-bit input (it
will not strip the eighth bit from the characters it reads),
regardless of what the terminal claims it can support.  The
default value is @code{off}.

@item convert-meta
@vindex convert-meta
If set to @code{on}, Readline will convert characters with the
eigth bit set to an ASCII key sequence by stripping the eigth
bit and prepending an @key{ESC} character, converting them to a
meta-prefixed key sequence.  The default value is @code{on}.

@item output-meta
@vindex output-meta
If set to @code{on}, Readline will display characters with the
eighth bit set directly rather than as a meta-prefixed escape
sequence.  The default is @code{off}.

@item completion-query-items
@vindex completion-query-items
The number of possible completions that determines when the user is
asked whether he wants to see the list of possibilities.  If the
number of possible completions is greater than this value,
Readline will ask the user whether or not he wishes to view
them; otherwise, they are simply listed.  The default limit is
@code{100}.

@item keymap
@vindex keymap
Sets Readline's idea of the current keymap for key binding commands.
Acceptable @code{keymap} names are
@code{emacs},
@code{emacs-standard},
@code{emacs-meta},
@code{emacs-ctlx},
@code{vi},
@code{vi-move},
@code{vi-command}, and
@code{vi-insert}.
@code{vi} is equivalent to @code{vi-command}; @code{emacs} is
equivalent to @code{emacs-standard}.  The default value is @code{emacs}.
The value of the @code{editing-mode} variable also affects the
default keymap.

@item show-all-if-ambiguous
@vindex show-all-if-ambiguous
This alters the default behavior of the completion functions.  If
set to @code{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 @code{off}.

@item expand-tilde
@vindex expand-tilde
If set to @code{on}, tilde expansion is performed when Readline
attempts word completion.  The default is @code{off}.

@end table

@item Key Bindings
The syntax for controlling key bindings in the init file is
simple.  First you have to know the name of the command that you
want to change.  The following pages contain tables of the command name,
the default keybinding, and a short description of what the command
does.

Once you know the name of the command, simply place the name of the key
you wish to bind the command to, a colon, and then the name of the
command on a line in the init file.  The name of the key
can be expressed in different ways, depending on which is most
comfortable for you.

@table @asis
@item @w{@var{keyname}: @var{function-name} or @var{macro}}
@var{keyname} is the name of a key spelled out in English.  For example:
@example
Control-u: universal-argument
Meta-Rubout: backward-kill-word
Control-o: ">&output"
@end example

In the above example, @samp{C-u} is bound to the function
@code{universal-argument}, and @samp{C-o} is bound to run the macro
expressed on the right hand side (that is, to insert the text
@samp{>&output} into the line).

@item @w{"@var{keyseq}": @var{function-name} or @var{macro}}
@var{keyseq} differs from @var{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 the
special character names are not recognized.

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

In the above example, @samp{C-u} is bound to the function
@code{universal-argument} (just as it was in the first example),
@samp{C-x C-r} is bound to the function @code{re-read-init-file}, and
@samp{ESC [ 1 1 ~} is bound to insert the text @samp{Function Key 1}.
The following escape sequences are available when specifying key
sequences:

@table @code
@item @kbd{\C-}
control prefix
@item @kbd{\M-}
meta prefix
@item @kbd{\e}
an escape character
@item @kbd{\\}
backslash
@item @kbd{\"}
@key{"}
@item @kbd{\'}
@key{'}
@end table

When entering the text of a macro, single or double quotes should
be used to indicate a macro definition.  Unquoted text
is assumed to be a function name.  Backslash
will quote any character in the macro text, including @key{"}
and @key{'}.
For example, the following binding will make @kbd{C-x \}
insert a single @key{\} into the line:
@example
"\C-x\\": "\\"
@end example

@end table
@end table

@node Conditional Init Constructs
@subsection 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 three parser directives used.

@ftable @code
@item $if
The @code{$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 extends to the end of the line;
no characters are required to isolate it.

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

@item term
The @code{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
@samp{=} is tested against the full name of the terminal and the
portion of the terminal name before the first @samp{-}.  This
allows @var{sun} to match both @var{sun} and @var{sun-cmd},
for instance.

@item application
The @var{application} construct is used to include
application-specific settings.  Each program using the Readline
library sets the @var{application name}, and you can test for it. 
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:
@example
$if bash
# Quote the current or previous word
"\C-xq": "\eb\"\ef\""
$endif
@end example
@end table

@item $endif
This command, as you saw in the previous example, terminates an
@code{$if} command.

@item $else
Commands in this branch of the @code{$if} directive are executed if
the test fails.
@end ftable

@node Bindable Readline Commands
@section 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.
@end menu

@node Commands For Moving
@subsection Commands For Moving
@ftable @code
@item beginning-of-line (C-a)
Move to the start of the current line.

@item end-of-line (C-e)
Move to the end of the line.

@item forward-char (C-f)
Move forward a character.

@item backward-char (C-b)
Move back a character.

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

@item backward-word (M-b)
Move back to the start of this, or the previous, word.  Words are
composed of letters and digits.

@item clear-screen (C-l)
Clear the screen and redraw the current line,
leaving the current line at the top of the screen.

@item redraw-current-line ()
Refresh the current line.  By default, this is unbound.

@end ftable

@node Commands For History
@subsection Commands For Manipulating The History

@ftable @code
@item accept-line (Newline, Return)
@ifset BashFeatures
Accept the line regardless of where the cursor is.  If this line is
non-empty, add it to the history list according to the setting of
the @code{HISTCONTROL} variable.  If this line was a history
line, then restore the history line to its original state.
@end ifset
@ifclear BashFeatures
Accept the line regardless of where the cursor is.  If this line is
non-empty, add it to the history list.  If this line was a history
line, then restore the history line to its original state.
@end ifclear

@item previous-history (C-p)
Move `up' through the history list.

@item next-history (C-n)
Move `down' through the history list.

@item beginning-of-history (M-<)
Move to the first line in the history.

@item end-of-history (M->)
Move to the end of the input history, i.e., the line you are entering.

@item 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.

@item forward-search-history (C-s)
Search forward starting at the current line and moving `down' through
the the history as necessary.  This is an incremental search.

@item 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.

@item non-incremental-forward-search-history (M-n)
Search forward starting at the current line and moving `down'
through the the history as necessary using a non-incremental search
for a string supplied by the user.

@item history-search-forward ()
Search forward through the history for the string of characters
between the start of the current line and the current point.  This
is a non-incremental search.  By default, this command is unbound.

@item history-search-backward ()
Search backward through the history for the string of characters
between the start of the current line and the current point.  This
is a non-incremental search.  By default, this command is unbound.

@item yank-nth-arg (M-C-y)
Insert the first argument to the previous command (usually
the second word on the previous line).  With an argument @var{n},
insert the @var{n}th word from the previous command (the words
in the previous command begin with word 0).  A negative argument
inserts the @var{n}th word from the end of the previous command.

@item yank-last-arg (M-., M-_)
Insert last argument to the previous command (the last word on the
previous line).  With an
argument, behave exactly like @code{yank-nth-arg}.

@end ftable

@node Commands For Text
@subsection Commands For Changing Text

@ftable @code
@item delete-char (C-d)
Delete the character under the cursor.  If the cursor is at the
beginning of the line, there are no characters in the line, and
the last character typed was not C-d, then return EOF.

@item backward-delete-char (Rubout)
Delete the character behind the cursor.  A numeric arg says to kill
the characters instead of deleting them.

@item quoted-insert (C-q, C-v)
Add the next character that you type to the line verbatim.  This is
how to insert key sequences like @key{C-q}, for example.

@item tab-insert (M-TAB)
Insert a tab character.

@item self-insert (a, b, A, 1, !, ...)
Insert yourself.

@item 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 argumentss don't work.

@item transpose-words (M-t)
Drag the word behind the cursor past the word in front of the cursor
moving the cursor over that word as well.

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

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

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

@end ftable

@node Commands For Killing
@subsection Killing And Yanking

@ftable @code

@item kill-line (C-k)
Kill the text from the current cursor position to the end of the line.

@item backward-kill-line (C-x Rubout)
Kill backward to the beginning of the line.

@item unix-line-discard (C-u)
Kill backward from the cursor to the beginning of the current line.
Save the killed text on the kill-ring.

@item kill-whole-line ()
Kill all characters on the current line, no matter where the
cursor is.  By default, this is unbound.

@item kill-word (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 @code{forward-word}.

@item backward-kill-word (M-DEL)
Kill the word behind the cursor.  Word boundaries are the same
as @code{backward-word}.

@item unix-word-rubout (C-w)
Kill the word behind the cursor, using white space as a word
boundary.  The killed text is saved on the kill-ring.

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

@item yank (C-y)
Yank the top of the kill ring into the buffer at the current
cursor position.

@item 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.
@end ftable

@node Numeric Arguments
@subsection Specifying Numeric Arguments
@ftable @code

@item 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.

@item universal-argument ()
Each time this is executed, the argument count is multiplied by four.
The argument count is initially one, so executing this function the
first time makes the argument count four.  By default, this is not
bound to a key.
@end ftable

@node Commands For Completion
@subsection Letting Readline Type For You

@ftable @code
@item complete (TAB)
Attempt to do completion on the text before the cursor.  This is
application-specific.  Generally, if you are typing a filename
argument, you can do filename completion; if you are typing a command,
you can do command completion, if you are typing in a symbol to GDB, you
can do symbol name completion, if you are typing in a variable to Bash,
you can do variable name completion, and so on.
@ifset BashFeatures
See the Bash manual page for a complete list of available completion
functions.
@end ifset

@item possible-completions (M-?)
List the possible completions of the text before the cursor.

@item insert-completions ()
Insert all completions of the text before point that would have
been generated by @code{possible-completions}.  By default, this
is not bound to a key.

@end ftable

@node Keyboard Macros
@subsection Keyboard Macros
@ftable @code

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

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

@item 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.

@end ftable

@node Miscellaneous Commands
@subsection Some Miscellaneous Commands
@ftable @code

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

@item abort (C-g)
Abort the current editing command and
ring the terminal's bell (subject to the setting of
@code{bell-style}).

@item do-uppercase-version (M-a, M-b, ...)
Run the command that is bound to the corresoponding uppercase
character.

@item prefix-meta (ESC)
Make the next character that you type be metafied.  This is for people
without a meta key.  Typing @samp{ESC f} is equivalent to typing
@samp{M-f}.

@item undo (C-_, C-x C-u)
Incremental undo, separately remembered for each line.

@item revert-line (M-r)
Undo all changes made to this line.  This is like typing the @code{undo}
command enough times to get back to the beginning.

@item tilde-expand (M-~)
Perform tilde expansion on the current word.

@item 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 @var{inputrc} file.

@ifset BashFeatures
@item display-shell-version (C-x C-v)
Display version information about the current instance of Bash.

@item shell-expand-line (M-C-e)
Expand the line the way the shell does when it reads it.  This
performs alias and history expansion as well as all of the shell
word expansions.

@item history-expand-line (M-^)
Perform history expansion on the current line.

@item insert-last-argument (M-., M-_)
A synonym for @code{yank-last-arg}.

@item operate-and-get-next (C-o)
Accept the current line for execution and fetch the next line
relative to the current line from the history for editing.  Any
argument is ignored.

@item emacs-editing-mode (C-e)
When in @code{vi} editing mode, this causes a switch back to
emacs editing mode, as if the command @code{set -o emacs} had
been executed.

@end ifset

@end ftable

@node Readline vi Mode
@section Readline vi Mode

While the Readline library does not have a full set of @code{vi}
editing functions, it does contain enough to allow simple editing
of the line.  The Readline @code{vi} mode behaves as specified in
the Posix 1003.2 standard.

@ifset BashFeatures
In order to switch interactively between @code{Emacs} and @code{Vi}
editing modes, use the @code{set -o emacs} and @code{set -o vi}
commands (@pxref{The Set Builtin}).
@end ifset
@ifclear BashFeatures
In order to switch interactively between @code{Emacs} and @code{Vi}
editing modes, use the command M-C-j (toggle-editing-mode).
@end ifclear
The Readline default is @code{emacs} mode.

When you enter a line in @code{vi} mode, you are already placed in
`insertion' mode, as if you had typed an @samp{i}.  Pressing @key{ESC}
switches you into `command' mode, where you can edit the text of the
line with the standard @code{vi} movement keys, move to previous
history lines with @samp{k}, and following lines with @samp{j}, and
so forth.