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@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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|
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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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|
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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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|
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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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@chapter 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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|
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The History library provides a history expansion feature that is similar |
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to the history expansion in Csh. The following text describes the sytax |
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that you use to manipulate the history information. |
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|
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History expansion takes place in two parts. The first is to determine |
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which line from the previous history should be used during substitution. |
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The second is to select portions of that line for inclusion into the |
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current one. The line selected from the previous history is called the |
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@dfn{event}, and the portions of that line that are acted upon are |
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called @dfn{words}. The line is broken into words in the same fashion |
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that the Bash shell does, so that several English (or Unix) words |
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surrounded by quotes are considered as one word. |
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|
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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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|
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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 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 specification from the word designator. It |
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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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|
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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 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, so it really isn't a word designator, and doesn't |
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belong in 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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