159 lines
4.7 KiB
Text
159 lines
4.7 KiB
Text
@ignore
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This file is completely identical to hsuser.texinfo, except that it has the
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reference to the programming manual removed. There are definately better ways
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to do this!
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This file documents the user interface to the GNU History library.
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Copyright (C) 1988, 1991 Free Software Foundation, Inc.
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Authored by Brian Fox.
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Permission is granted to make and distribute verbatim copies of this manual
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provided the copyright notice and this permission notice are preserved on
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all copies.
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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 copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided also that the
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GNU Copyright statement is available to the distributee, and provided that
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the entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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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 Using History Interactively
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@appendix Using History Interactively
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This chapter describes how to use the GNU History Library interactively,
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from a user's standpoint.
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@menu
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* History Interaction:: What it feels like using History as a user.
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@end menu
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@node History Interaction
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@section History Interaction
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@cindex expansion
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The History library provides a history expansion feature similar
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to the history expansion in @code{csh}. The following text describes the
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syntax you use to manipulate history information.
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History expansion takes two parts. In the first part, determine
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which line from the previous history will be used for substitution.
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This line is called the @dfn{event}.
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In the second part, select portions of that line for inclusion into the
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current line. These portions are called @dfn{words}.
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@value{GDBN} breaks the line into words in the same
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way that the Bash shell does, so that several English (or Unix) words
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surrounded by quotes are considered one word.
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@menu
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* Event Designators:: How to specify which history line to use.
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* Word Designators:: Specifying which words are of interest.
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* Modifiers:: Modifying the results of susbstitution.
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@end menu
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@node Event Designators
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@subsection Event Designators
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@cindex event designators
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An @dfn{event designator} is a reference to a command line entry in the
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history list.
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@table @asis
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@item @code{!}
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Start a history subsititution, except when followed by a space, tab, or
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the end of the line... @key{=} or @key{(}.
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@item @code{!!}
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Refer to the previous command. This is a synonym for @code{!-1}.
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@item @code{!n}
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Refer to command line @var{n}.
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@item @code{!-n}
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Refer to the command line @var{n} lines back.
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@item @code{!string}
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Refer to the most recent command starting with @var{string}.
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@item @code{!?string}[@code{?}]
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Refer to the most recent command containing @var{string}.
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@end table
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@node Word Designators
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@subsection Word Designators
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A @key{:} separates the event designator from the @dfn{word designator}.
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It can be omitted if the word designator begins with a @key{^}, @key{$},
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@key{*} or @key{%}. Words are numbered from the beginning of the line,
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with the first word being denoted by a 0 (zero).
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@table @code
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@item 0 (zero)
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The zero'th word. For many applications, this is the command word.
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@item n
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The @var{n}'th word.
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@item ^
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The first argument. that is, word 1.
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@item $
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The last argument.
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@item %
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The word matched by the most recent @code{?string?} search.
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@item x-y
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A range of words; @code{-@var{y}} Abbreviates @code{0-@var{y}}.
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@item *
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All of the words, excepting the zero'th. This is a synonym for @code{1-$}.
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It is not an error to use @key{*} if there is just one word in the event.
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The empty string is returned in that case.
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@end table
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@node Modifiers
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@subsection Modifiers
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After the optional word designator, you can add a sequence of one or more
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of the following @dfn{modifiers}, each preceded by a @key{:}.
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@table @code
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@item #
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The entire command line typed so far. This means the current command,
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not the previous command.
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@c
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@c FIXME: If it doesn't belong here, let's put it where it does.
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@c
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@c so it technically isn't a word designator and doesn't belong in
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@c this section.
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@item h
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Remove a trailing pathname component, leaving only the head.
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@item r
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Remove a trailing suffix of the form @samp{.}@var{suffix}, leaving the basename.
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@item e
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Remove all but the suffix.
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@item t
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Remove all leading pathname components, leaving the tail.
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@item p
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Print the new command but do not execute it.
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@end table
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