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readline/inc-readline.texinfo
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readline/inc-readline.texinfo
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@ignore
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This file documents the end user interface to the GNU command line
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editing feautres. It is to be an appendix to manuals for programs which
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use these features. There is a document entitled "readline.texinfo"
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which contains both end-user and programmer documentation for the GNU
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Readline Library.
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Copyright (C) 1988 Free Software Foundation, Inc.
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Authored by Brian Fox.
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Permission is granted to process this file through Tex and print the
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results, provided the printed document carries copying permission notice
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||||
identical to this one except for the removal of this paragraph (this
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paragraph not being relevant to the printed manual).
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||||
|
||||
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
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||||
into another language, under the above conditions for modified versions.
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@end ignore
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@node Command Line Editing, , , Top
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@appendix Command Line Editing
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This appendix describes GNU's command line editing interface.
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@menu
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* Introduction and Notation:: Notation used in this appendix.
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* Basic Line Editing:: The minimum set of commands for editing a line.
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* Movement Commands:: Commands for moving the cursor about the line.
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||||
* Cutting and Pasting:: Deletion and copying of text sections.
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* Transposition:: Exchanging two characters or words.
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* Completion:: Expansion of a partially typed word into
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the full text.
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@end menu
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@node Introduction and Notation, Basic Line Editing, Command Line Editing, Command Line Editing
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@section Introduction to Line Editing
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In this appendix a the following notation is used to describe
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keystrokes.
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The text @key{C-k} is read as `Control-K' and describes the character
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produced when the Control key is depressed and the @key{k} key is struck.
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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}
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||||
key is struck. If you do not have a meta key, the identical keystroke
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can be generated by typing @key{ESC} @i{first}, and then typing @key{k}.
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Either process is known as @dfn{metafying} the @key{k} key.
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The text @key{M-C-k} is read as `Meta-Control-k' and describes the
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character produced by @dfn{metafying} @key{C-k}.
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In addition, several keys have their own names. Specifically,
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@key{DEL}, @key{ESC}, @key{LFD}, @key{SPC}, @key{RET}, and @key{TAB} all
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stand for themselves when seen in this text, or in an init file
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||||
(@pxref{Readline Init File}, for more info).
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@node Readline Interaction, Readline Init File, Readline Introduction, Readline Top
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@section Readline Interaction
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@cindex interaction, readline
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Often during an interactive session you will type in a long line of
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text, only to notice that the first word on the line is misspelled. The
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Readline library gives you a set of commands for manipulating the text
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as you type it in, allowing you to just fix your typo, and not forcing
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you to retype the majority of the line. Using these editing commands,
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you move the cursor to the place that needs correction, and delete or
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insert the text of the corrections. Then, when you are satisfied with
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the line, you simply press @key{RETURN}. You do not have to be at the
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end of the line to press @key{RETURN}; the entire line will be accepted
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in any case.
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@menu
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* Readline Bare Essentials:: The least you need to know about Readline.
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* Readline Movement Commands:: Moving about the input line.
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* Readline Killing Commands:: How to delete text, and how to get it back!
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* Readline Arguments:: Giving numeric arguments to commands.
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@end menu
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@node Readline Bare Essentials, Readline Movement Commands, Readline Interaction, Readline Interaction
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@subsection Readline Bare Essentials
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In order to enter characters into the line, simply type them. The typed
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character appears where the cursor was, and then the cursor moves one
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space to the right. If you mistype a character, you can use @key{DEL} to
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back up, and delete the mistyped character.
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|
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Sometimes you may miss typing a character that you wanted to type, and
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not notice your error until you have typed several other characters. In
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that case, you can type @key{C-b} to move the cursor to the left, and then
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correct your mistake. Aftwerwards, you can move the cursor to the right
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with @key{C-f}.
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When you add text in the middle of a line, you will notice that characters
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to the right of the cursor get `pushed over' to make room for the text
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that you have inserted. Likewise, when you delete text behind the cursor,
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characters to the right of the cursor get `pulled back' to fill in the
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blank space created by the removal of the text. A list of the basic bare
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essentials for editing the text of an input line follows.
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@table @asis
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@item @key{C-b}
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Move back one character.
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@item @key{C-f}
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Move forward one character.
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@item @key{DEL}
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Delete the character to the left of the cursor.
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@item @key{C-d}
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Delete the character underneath the cursor.
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@item @w{Printing characters}
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Insert itself into the line at the cursor.
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@item @key{C-_}
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Undo the last thing that you did. You can undo all the way back to an
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empty line.
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@end table
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@node Readline Movement Commands, Readline Killing Commands, Readline Bare Essentials, Readline Interaction
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@subsection Readline Movement Commands
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|
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|
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The above table describes the most basic possible keystrokes that you need
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in order to do editing of the input line. For your convenience, many
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other commands have been added in addition to @key{C-b}, @key{C-f},
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@key{C-d}, and @key{DEL}. Here are some commands for moving more rapidly
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about the line.
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@table @key
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@item C-a
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Move to the start of the line.
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@item C-e
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Move to the end of the line.
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@item M-f
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Move forward a word.
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@item M-b
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Move backward a word.
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@item C-l
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Clear the screen, reprinting the current line at the top.
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@end table
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Notice how @key{C-f} moves forward a character, while @key{M-f} moves
|
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forward a word. It is a loose convention that control keystrokes
|
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operate on characters while meta keystrokes operate on words.
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||||
|
||||
@node Readline Killing Commands, Readline Arguments, Readline Movement Commands, Readline Interaction
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@subsection Readline Killing Commands
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The act of @dfn{cutting} text means to delete the text from the line, and
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to save away the deleted text for later use, just as if you had cut the
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text out of the line with a pair of scissors. There is a
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@dfn{Killing} text means to delete the text from the line, but to save
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it away for later use, usually by @dfn{yanking} it back into the line.
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If the description for a command says that it `kills' text, then you can
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be sure that you can get the text back in a different (or the same)
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place later.
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Here is the list of commands for killing text.
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@table @key
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@item C-k
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Kill the text from the current cursor position to the end of the line.
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@item M-d
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Kill from the cursor to the end of the current word, or if between
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words, to the end of the next word.
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@item M-DEL
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Kill fromthe cursor the start ofthe previous word, or if between words, to the start of the previous word.
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@item C-w
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Kill from the cursor to the previous whitespace. This is different than
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@key{M-DEL} because the word boundaries differ.
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@end table
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And, here is how to @dfn{yank} the text back into the line. Yanking
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is
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@table @key
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@item C-y
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Yank the most recently killed text back into the buffer at the cursor.
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@item M-y
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Rotate the kill-ring, and yank the new top. You can only do this if
|
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the prior command is @key{C-y} or @key{M-y}.
|
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@end table
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|
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When you use a kill command, the text is saved in a @dfn{kill-ring}.
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Any number of consecutive kills save all of the killed text together, so
|
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that when you yank it back, you get it in one clean sweep. The kill
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ring is not line specific; the text that you killed on a previously
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typed line is available to be yanked back later, when you are typing
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another line.
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|
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@node Readline Arguments, , Readline Killing Commands, Readline Interaction
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@subsection Readline Arguments
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|
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You can pass numeric arguments to Readline commands. Sometimes the
|
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argument acts as a repeat count, other times it is the @i{sign} of the
|
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argument that is significant. If you pass a negative argument to a
|
||||
command which normally acts in a forward direction, that command will
|
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act in a backward direction. For example, to kill text back to the
|
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start of the line, you might type @key{M--} @key{C-k}.
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|
||||
The general way to pass numeric arguments to a command is to type meta
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digits before the command. If the first `digit' you type is a minus
|
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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
|
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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}.
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|
||||
|
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@node Readline Init File, , Readline Interaction, Readline Top
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@section Readline Init File
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|
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Although the Readline library comes with a set of Emacs-like
|
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keybindings, it is possible that you would like to use a different set
|
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of keybindings. You can customize programs that use Readline by putting
|
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commands in an @dfn{init} file in your home directory. The name of this
|
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file is @file{~/.inputrc}.
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|
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When a program which uses the Readline library starts up, the
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@file{~/.inputrc} file is read, and the keybindings are set.
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|
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@menu
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* Readline Init Syntax:: Syntax for the commands in @file{~/.inputrc}.
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* Readline Vi Mode:: Switching to @code{vi} mode in Readline.
|
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@end menu
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@node Readline Init Syntax, Readline Vi Mode, Readline Init File, Readline Init File
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@subsection Readline Init Syntax
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You can start up with a vi-like editing mode by placing
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@example
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@code{set editing-mode vi}
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@end example
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||||
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in your @file{~/.inputrc} file.
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You can have Readline use a single line for display, scrolling the input
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between the two edges of the screen by placing
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@example
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@code{set horizontal-scroll-mode On}
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||||
@end example
|
||||
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||||
in your @file{~/.inputrc} file.
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||||
|
||||
The syntax for controlling keybindings in the @file{~/.inputrc} file is
|
||||
simple. First you have to know the @i{name} of the command that you
|
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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
|
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command on a line in the @file{~/.inputrc} file. Here is an example:
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||||
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@example
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# This is a comment line.
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Meta-Rubout: backward-kill-word
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Control-u: universal-argument
|
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@end example
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||||
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@menu
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* Commands For Moving:: Moving about the line.
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* Commands For History:: Getting at previous lines.
|
||||
* Commands For Text:: Commands for changing text.
|
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* Commands For Killing:: Commands for killing and yanking.
|
||||
* Numeric Arguments:: Specifying numeric arguments, repeat counts.
|
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* Commands For Completion:: Getting Readline to do the typing for you.
|
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* Miscellaneous Commands:: Other miscillaneous commands.
|
||||
@end menu
|
||||
|
||||
@node Commands For Moving, Commands For History, Readline Init Syntax, Readline Init Syntax
|
||||
@subsubsection Commands For Moving
|
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@table @code
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@item beginning-of-line (C-a)
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Move to the start of the current line.
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@item end-of-line (C-e)
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Move to the end of the line.
|
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|
||||
@item forward-char (C-f)
|
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Move forward a character.
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|
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@item backward-char (C-b)
|
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Move back a character.
|
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|
||||
@item forward-word (M-f)
|
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Move forward to the end of the next word.
|
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|
||||
@item backward-word (M-b)
|
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Move back to the start of this, or the previous, word.
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|
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@item clear-screen (C-l)
|
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Clear the screen leaving the current line at the top of the screen.
|
||||
|
||||
@end table
|
||||
|
||||
@node Commands For History, Commands For Text, Commands For Moving, Readline Init Syntax
|
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@subsubsection Commands For Manipulating The History
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@table @code
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@item accept-line (Newline, Return)
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Accept the line regardless of where the cursor is. If this line is
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non-empty, add it too the history list. If this line was a history
|
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line, then restore the history line to its original state.
|
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|
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@item previous-history (C-p)
|
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Move `up' through the history list.
|
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|
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@item next-history (C-n)
|
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Move `down' through the history list.
|
||||
|
||||
@item beginning-of-history (M-<)
|
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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
|
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the the history as neccessary.
|
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|
||||
@end table
|
||||
|
||||
@node Commands For Text, Commands For Killing, Commands For History, Readline Init Syntax
|
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@subsubsection Commands For Changing Text
|
||||
|
||||
@table @code
|
||||
@item delete-char (C-d)
|
||||
Delete the character under the cursor. If the cursor is at the
|
||||
beginning of the line, and 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 things like 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 point forward over the character at point.
|
||||
Point moves forward as well. If point is at the end of the line, then
|
||||
transpose the two characters before point. Negative args 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 point.
|
||||
|
||||
@item downcase-word (M-l)
|
||||
Lowercase the current (or following) word. With a negative argument,
|
||||
do the previous word, but do not move point.
|
||||
|
||||
@item capitalize-word (M-c)
|
||||
Uppercase the current (or following) word. With a negative argument,
|
||||
do the previous word, but do not move point.
|
||||
|
||||
@end table
|
||||
|
||||
@node Commands For Killing, Numeric Arguments, Commands For Text, Readline Init Syntax
|
||||
@subsubsection Killing And Yanking
|
||||
|
||||
@table @code
|
||||
|
||||
@item kill-line (C-k)
|
||||
Kill the text from the current cursor position to the end of the line.
|
||||
|
||||
@item backward-kill-line ()
|
||||
Kill backward to the beginning of the line. This is normally 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.
|
||||
|
||||
@item backward-kill-word (M-DEL)
|
||||
Kill the word behind the cursor.
|
||||
|
||||
@item unix-line-discard (C-u)
|
||||
Do what C-u used to do in Unix line input. We save the killed text on
|
||||
the kill-ring, though.
|
||||
|
||||
@item unix-word-rubout (C-w)
|
||||
Do what C-w used to do in Unix line input. The killed text is saved
|
||||
on the kill-ring. This is different than backward-kill-word because
|
||||
the word boundaries differ.
|
||||
|
||||
@item yank (C-y)
|
||||
Yank the top of the kill ring into the buffer at point.
|
||||
|
||||
@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 table
|
||||
|
||||
@node Numeric Arguments, Commands For Completion, Commands For Killing, Readline Init Syntax
|
||||
@subsubsection Specifying Numeric Arguments
|
||||
@table @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 ()
|
||||
Do what C-u does in emacs. By default, this is not bound.
|
||||
@end table
|
||||
|
||||
|
||||
@node Commands For Completion, Miscellaneous Commands, Numeric Arguments, Readline Init Syntax
|
||||
@subsubsection Letting Readline Type For You
|
||||
|
||||
@table @code
|
||||
@item complete (TAB)
|
||||
Attempt to do completion on the text before point. This is
|
||||
implementation defined. 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...
|
||||
|
||||
@item possible-completions (M-?)
|
||||
List the possible completions of the text before point.
|
||||
@end table
|
||||
|
||||
@node Miscellaneous Commands, , Commands For Completion, Readline Init Syntax
|
||||
@subsubsection Some Miscellaneous Commands
|
||||
@table @code
|
||||
|
||||
@item abort (C-g)
|
||||
Ding! Stops things.
|
||||
|
||||
@item do-uppercase-version (M-a, M-b, ...)
|
||||
Run the command that is bound to your uppercase brother.
|
||||
|
||||
@item prefix-meta (ESC)
|
||||
Make the next character that you type be metafied. This is for
|
||||
people without a meta key. @key{ESC-f} is equivalent to @key{M-f}.
|
||||
|
||||
@item undo (C-_)
|
||||
Incremental undo, separately remembered for each line.
|
||||
|
||||
@item revert-line (M-r)
|
||||
Undo all changes made to this line. This is like typing the `undo'
|
||||
command enough times to get back to the beginning.
|
||||
@end table
|
||||
|
||||
@node Readline Vi Mode, , Readline Init Syntax, Readline Init File
|
||||
@subsection 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.
|
||||
|
||||
In order to switch interactively between Emacs and Vi editing modes, use
|
||||
the command M-C-j (toggle-editing-mode).
|
||||
|
||||
When you enter a line in Vi mode, you are already placed in `insertion'
|
||||
mode, as if you had typed an `i'. Pressing @key{ESC} switches you into
|
||||
`edit' mode, where you can edit the text of the line with the standard
|
||||
Vi movement keys, move to previous history lines with `k', and following
|
||||
lines with `j', and so forth.
|
||||
|
||||
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user