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-\input texinfo.tex
-@setfilename history.info
-
-@ifinfo
-This file documents the GNU History library.
-
-Copyright (C) 1988 Free Software Foundation, Inc.
-Authored by Brian Fox.
-
-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.
-
-@ignore
-Permission is granted to process this file through Tex and print the
-results, provided the printed document carries copying permission notice
-identical to this one except for the removal of this paragraph (this
-paragraph not being relevant to the printed manual).
-@end ignore
-
-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
-into another language, under the above conditions for modified versions.
-@end ifinfo
-
-@node Top, Introduction, , (DIR)
-
-This document describes the GNU History library, a programming tool that
-provides a consistent user interface for recalling lines of previously
-typed input.
-
-@menu
-* Introduction:: What is the GNU History library for?
-* Interactive Use:: What it feels like using History as a user.
-* Programming:: How to use History in your programs.
-@end menu
-
-@node Introduction, Interactive Use, , Top
-@unnumbered Introduction
-
-Many programs read input from the user a line at a time. The GNU history
-library is able to keep track of those lines, associate arbitrary data with
-each line, and utilize information from previous lines in making up new
-ones.
-
-The programmer using the History library has available to him functions for
-remembering lines on a history stack, associating arbitrary data with a
-line, removing lines from the stack, searching through the stack for a
-line containing an arbitrary text string, and referencing any line on the
-stack directly. In addition, a history @dfn{expansion} function is
-available which provides for a consistent user interface across many
-different programs.
-
-The end-user using programs written with the History library has the
-benifit of a consistent user interface, with a set of well-known commands
-for manipulating the text of previous lines and using that text in new
-commands. The basic history manipulation commands are similar to the
-history substitution used by Csh.
-
-If the programmer desires, he can use the Readline library, which includes
-history manipulation by default, and has the added advantage of Emacs style
-command line editing.
-
-@node Interactive Use, Programming, Introduction, Top
-@chapter Interactive Use
-
-@section History Expansion
-@cindex expansion
-
-The History library provides a history expansion feature that is similar to
-the history expansion in Csh. The following text describes what syntax
-features are available.
-
-History expansion takes place in two parts. The first is to determine
-which line from the previous history should be used during substitution.
-The second is to select portions of that line for inclusion into the
-current one. The line selected from the previous history is called the
-@dfn{event}, and the portions of that line that are acted upon are called
-@dfn{words}. The line is broken into words in the same fashion that the
-Bash shell does, so that several English (or Unix) words surrounded by
-quotes are considered as one word.
-
-@menu
-* Event Designators:: How to specify which history line to use.
-* Word Designators:: Specifying which words are of interest.
-* Modifiers:: Modifying the results of susbstitution.
-@end menu
-
-@node Event Designators, Word Designators, , Interactive Use
-@subsection Event Designators
-@cindex event designators
-
-An event designator is a reference to a command line entry in the history
-list.
-
-@table @var
-
-@item !
-Start a history subsititution, except when followed by a @key{SPC},
-@key{TAB}, @key{RET}, @key{=} or @key{(}.
-
-@item !!
-Refer to the previous command. This is a synonym for @code{!-1}.
-
-@item !n
-Refer to command line @var{n}.
-
-@item !-n
-Refer to the current command line minus @var{n}.
-
-@item !string
-Refer to the most recent command starting with @var{string}.
-
-@item !?string[?]
-Refer to the most recent command containing @var{string}.
-
-@end table
-
-@node Word Designators, Modifiers, Event Designators, Interactive Use
-@subsection Word Designators
-
-A @key{:} separates the event specification from the word designator. It
-can be omitted if the word designator begins with a @key{^}, @key{$},
-@key{*} or @key{%}. Words are numbered from the beginning of the line,
-with the first word being denoted by a 0 (zero).
-
-@table @asis
-
-@item @var{0} (zero)
-The zero'th word. For many applications, this is the command word.
-
-@item n
-The @var{n}'th word.
-
-@item @var{^}
-The first argument. that is, word 1.
-
-@item @var{$}
-The last argument.
-
-@item @var{%}
-The word matched by the most recent @code{?string?} search.
-
-@item @var{x}-@var{y}
-A range of words; @code{-@var{y}} is equivalent to @code{0-@var{y}}.
-
-@item @var{*}
-All of the words, excepting the zero'th. This is a synonym for @samp{1-$}.
-It is not an error to use @samp{*} if there is just one word in the event.
-The empty string is returned in that case.
-
-@end table
-
-@node Modifiers, , Word Designators, Interactive Use
-@subsection Modifiers
-
-After the optional word designator, you can add a sequence of one or more
-of the following modifiers, each preceded by a @key{:}.
-
-@table @code
-
-@item #
-The entire command line typed so far. This means the current command,
-not the previous command, so it really isn't a word designator, and doesn't
-belong in this section.
-
-@item h
-Remove a trailing pathname component, leaving only the head.
-
-@item r
-Remove a trailing suffix of the form ".xxx", leaving the basename (root).
-
-@item e
-Remove all but the suffix (end).
-
-@item t
-Remove all leading pathname components (before the last slash), leaving
-the tail.
-
-@item p
-Print the new command but do not execute it. This takes effect
-immediately, so it should be the last specifier on the line.
-
-@end table
-
-@node Programming, , Interactive Use, Top
-@chapter Programming
-
-@bye