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+\input texinfo.tex
+@setfilename history.info
+
+@c start-menu
+* History: (history).		The GNU History library.
+@c end-menu
+
+@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