Linux下Bash shell 手册 8.4 Bindable Readline Commands 收藏 评论
2012年03月02日

8.4 Bindable Readline Commands
==============================

This section describes Readline commands that may be bound to key
sequences.  You can list your key bindings by executing `bind -P' or,
for a more terse format, suitable for an INPUTRC file, `bind -p'.
(*Note Bash Builtins::.)  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".

8.4.1 Commands For Moving
-------------------------

`beginning-of-line (C-a)'
     Move to the start of the current line.

`end-of-line (C-e)'
     Move to the end of the line.

`forward-char (C-f)'
     Move forward a character.

`backward-char (C-b)'
     Move back a character.

`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.

`shell-forward-word ()'
     Move forward to the end of the next word.  Words are delimited by
     non-quoted shell metacharacters.

`shell-backward-word ()'
     Move back to the start of the current or previous word.  Words are
     delimited by non-quoted shell metacharacters.

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

`redraw-current-line ()'
     Refresh the current line.  By default, this is unbound.


8.4.2 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, add it to the history list according to the setting of
     the `HISTCONTROL' and `HISTIGNORE' variables.  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.

`next-history (C-n)'
     Move `forward' through the history list, fetching the next command.

`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.

`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.

`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.

`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.

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

`history-search-backward ()'
     Search backward through the history for the string of characters
     between the start of the current line and the point.  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, the argument is extracted 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 an argument, behave exactly like
     `yank-nth-arg'.  Successive calls to `yank-last-arg' move back
     through the history list, inserting the last argument of each line
     in turn.  The history expansion facilities are used to extract the
     last argument, as if the `!$' history expansion had been specified.


8.4.3 Commands For Changing Text
--------------------------------

`delete-char (C-d)'
     Delete the character at point.  If point is at the beginning of
     the line, there are no characters in the line, and the last
     character typed was not bound to `delete-char', then return EOF.

`backward-delete-char (Rubout)'
     Delete the character behind the cursor.  A numeric argument means
     to kill the characters 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.

`self-insert (a, b, A, 1, !, ...)'
     Insert yourself.

`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.


8.4.4 Killing And Yanking
-------------------------

`kill-line (C-k)'
     Kill the text from point to the end of the line.

`backward-kill-line (C-x Rubout)'
     Kill backward to the beginning 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'.

`shell-kill-word ()'
     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 `shell-forward-word'.

`backward-kill-word ()'
     Kill the word behind point.  Word boundaries are the same as
     `shell-backward-word'.

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

`unix-filename-rubout ()'
     Kill the word behind point, using white space and the slash
     character as the word boundaries.  The killed text is saved 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'.

8.4.5 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 or 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.

8.4.6 Letting Readline Type For You
-----------------------------------

`complete (<TAB>)'
     Attempt to perform completion on the text before point.  The
     actual completion performed is application-specific.  Bash
     attempts completion treating the text as a variable (if the text
     begins with `$'), username (if the text begins with `~'), hostname
     (if the text begins with `@'), or command (including aliases and
     functions) in turn.  If none of these produces a match, filename
     completion is attempted.

`possible-completions (M-?)'
     List the possible completions of the text before point.

`insert-completions (M-*)'
     Insert all completions of the text before point that would have
     been generated by `possible-completions'.

`menu-complete ()'
     Similar to `complete', but replaces the word to be completed with
     a single match from the list of possible completions.  Repeated
     execution of `menu-complete' steps through the list of possible
     completions, inserting each match in turn.  At the end of the list
     of completions, the bell is rung (subject to the setting of
     `bell-style') and the original text is restored.  An argument of N
     moves N positions forward in the list of matches; a negative
     argument may be used to move 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.

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

`complete-filename (M-/)'
     Attempt filename completion on the text before point.

`possible-filename-completions (C-x /)'
     List the possible completions of the text before point, treating
     it as a filename.

`complete-username (M-~)'
     Attempt completion on the text before point, treating it as a
     username.

`possible-username-completions (C-x ~)'
     List the possible completions of the text before point, treating
     it as a username.

`complete-variable (M-$)'
     Attempt completion on the text before point, treating it as a
     shell variable.

`possible-variable-completions (C-x $)'
     List the possible completions of the text before point, treating
     it as a shell variable.

`complete-hostname (M-@)'
     Attempt completion on the text before point, treating it as a
     hostname.

`possible-hostname-completions (C-x @)'
     List the possible completions of the text before point, treating
     it as a hostname.

`complete-command (M-!)'
     Attempt completion on the text before point, treating it as a
     command name.  Command completion attempts to match the text
     against aliases, reserved words, shell functions, shell builtins,
     and finally executable filenames, in that order.

`possible-command-completions (C-x !)'
     List the possible completions of the text before point, treating
     it as a command name.

`dynamic-complete-history (M-<TAB>)'
     Attempt completion on the text before point, comparing the text
     against lines from the history list for possible completion
     matches.

`dabbrev-expand ()'
     Attempt menu completion on the text before point, comparing the
     text against lines from the history list for possible completion
     matches.

`complete-into-braces (M-{)'
     Perform filename completion and insert the list of possible
     completions enclosed within braces so the list is available to the
     shell (*note Brace Expansion::).


8.4.7 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.


8.4.8 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-uppercase-version (M-a, M-b, M-X, ...)'
     If the metafied character X is lowercase, run the command that is
     bound to the corresponding uppercase character.

`prefix-meta (<ESC>)'
     Metafy the next character typed.  This is for keyboards without a
     meta key.  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 beginning.

`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, the
     mark is set to that position.

`exchange-point-and-mark (C-x C-x)'
     Swap the point with the mark.  The current cursor position is set
     to the saved position, and the old cursor position is saved as the
     mark.

`character-search (C-])'
     A character is read and point is moved to the next occurrence of
     that character.  A negative count searches for previous
     occurrences.

`character-search-backward (M-C-])'
     A character is read and point is moved to the previous occurrence
     of that character.  A negative count 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.  Such sequences begin
     with a Control Sequence Indicator (CSI), usually ESC-[.  If this
     sequence is bound to "\e[", keys producing such sequences will
     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, the value of the `comment-begin'
     variable is inserted 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', the value is inserted, otherwise the
     characters in `comment-begin' are deleted from the beginning of
     the line.  In either case, the line is accepted as if a newline
     had been typed.  The default value of `comment-begin' causes this
     command to make the current line a shell comment.  If a numeric
     argument causes the comment character to be removed, the line will
     be executed by the shell.

`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.  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.

`glob-complete-word (M-g)'
     The word before point is treated as a pattern for pathname
     expansion, with an asterisk implicitly appended.  This pattern is
     used to generate a list of matching file names for possible
     completions.

`glob-expand-word (C-x *)'
     The word before point is treated as a pattern for pathname
     expansion, and the list of matching file names is inserted,
     replacing the word.  If a numeric argument is supplied, a `*' is
     appended before pathname expansion.

`glob-list-expansions (C-x g)'
     The list of expansions that would have been generated by
     `glob-expand-word' is displayed, and the line is redrawn.  If a
     numeric argument is supplied, a `*' is appended before pathname
     expansion.

`display-shell-version (C-x C-v)'
     Display version information about the current instance of Bash.

`shell-expand-line (M-C-e)'
     Expand the line as the shell does.  This performs alias and
     history expansion as well as all of the shell word expansions
     (*note Shell Expansions::).

`history-expand-line (M-^)'
     Perform history expansion on the current line.

`magic-space ()'
     Perform history expansion on the current line and insert a space
     (*note History Interaction::).

`alias-expand-line ()'
     Perform alias expansion on the current line (*note Aliases::).

`history-and-alias-expand-line ()'
     Perform history and alias expansion on the current line.

`insert-last-argument (M-. or M-_)'
     A synonym for `yank-last-arg'.

`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.

`edit-and-execute-command (C-xC-e)'
     Invoke an editor on the current command line, and execute the
     result as shell commands.  Bash attempts to invoke `$VISUAL',
     `$EDITOR', and `emacs' as the editor, in that order.
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