rluser.texinfo

linux下bash源码

@end menu

This section describes Readline commands that may be bound to key
sequences.
@ifset BashFeatures
You can list your key bindings by executing
@w{@code{bind -P}} or, for a more terse format, suitable for an
@var{inputrc} file, @w{@code{bind -p}}.  (@xref{Bash Builtins}.)
@end ifset
Command names without an accompanying key sequence are unbound by default.

In the following descriptions, @dfn{point} refers to the current cursor
position, and @dfn{mark} refers to a cursor position saved by the
@code{set-mark} command.
The text between the point and mark is referred to as the @dfn{region}.

@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 the current or 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 or 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 @env{HISTCONTROL} and @env{HISTIGNORE} variables.
If this line is a modified 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, it may be added to the history list for future recall with
@code{add_history()}.
If this line is a modified history line, the history line is restored
to its original state.
@end ifclear

@item previous-history (C-p)
Move `back' through the history list, fetching the previous command.

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

@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 currently
being entered.

@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 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 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) at point.
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-. or M-_)
Insert last argument to the previous command (the last word of the
previous history entry).  With an
argument, behave exactly like @code{yank-nth-arg}.
Successive calls to @code{yank-last-arg} move back through the history
list, inserting the last argument of each line in turn.

@end ftable

@node Commands For Text
@subsection Commands For Changing Text

@ftable @code
@item 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 @code{delete-char}, then
return @sc{eof}.

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

@item 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.

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

@ifclear BashFeatures
@item tab-insert (M-@key{TAB})
Insert a tab character.
@end ifclear

@item self-insert (a, b, A, 1, !, @dots{})
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 arguments have no effect.

@item transpose-words (M-t)
Drag the word before point past the word after point,
moving point past that word as well.

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

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

@item capitalize-word (M-c)
Capitalize the current (or following) word.  With a negative argument,
capitalize 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 point 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.

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

@item 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 @code{forward-word}.

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

@item 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.

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

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

@item 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.

@item copy-backward-word ()
Copy the word before point to the kill buffer.
The word boundaries are the same as @code{backward-word}.
By default, this command is unbound.

@item copy-forward-word ()
Copy the word following point to the kill buffer.
The word boundaries are the same as @code{forward-word}.
By default, this command is unbound.

@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 @code{yank} or @code{yank-pop}.
@end ftable

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

@item digit-argument (@kbd{M-0}, @kbd{M-1}, @dots{} @kbd{M--})
Add this digit to the argument already accumulating, or start a new
argument.  @kbd{M--} starts a negative argument.

@item 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 @code{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.
@end ftable

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

@ftable @code
@item complete (@key{TAB})
Attempt to perform completion on the text before point.
The actual completion performed is application-specific.
@ifset BashFeatures
Bash attempts completion treating the text as a variable (if the
text begins with @samp{$}), username (if the text begins with
@samp{~}), hostname (if the text begins with @samp{@@}), or
command (including aliases and functions) in turn.  If none 
of these produces a match, filename completion is attempted.
@end ifset
@ifclear BashFeatures
The default is filename completion.
@end ifclear

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

@item insert-completions (M-*)
Insert all completions of the text before point that would have
been generated by @code{possible-completions}.

@item menu-complete ()
Similar to @code{complete}, but replaces the word to be completed
with a single match from the list of possible completions.
Repeated execution of @code{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 @code{bell-style})
and the original text is restored.
An argument of @var{n} moves @var{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 @key{TAB}, but is unbound
by default.

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

@ifset BashFeatures
@item complete-filename (M-/)
Attempt filename completion on the text before point.

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

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

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

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

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

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

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

@item 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.

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

@item dynamic-complete-history (M-@key{TAB})
Attempt completion on the text before point, comparing
the text against lines from the history list for possible
completion matches.

@item 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
(@pxref{Brace Expansion}).

@end ifset
@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 the @var{inputrc} 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, M-@var{x}, @dots{})
If the metafied character @var{x} is lowercase, run the command
that is bound to the corresponding uppercase character.

@item prefix-meta (@key{ESC})
Metafy the next character typed.  This is for keyboards
without a meta key.  Typing @samp{@key{ESC} f} is equivalent to typing
@kbd{M-f}.

@item undo (C-_ or 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 executing the @code{undo}
command enough times to get back to the beginning.

@ifset BashFeatures
@item tilde-expand (M-&)
@end ifset
@ifclear BashFeatures
@item tilde-expand (M-~)
@end ifclear
Perform tilde expansion on the current word.

@item set-mark (C-@@)