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+@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.
+@end ifinfo
+
+@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).
+
+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 ignore
+
+@node History Top
+@ifinfo
+This file is meant to be an inclusion in the documentation of programs
+that use the history library features.  There is also a standalone
+document, entitled @file{history.texinfo}.
+@end ifinfo
+
+This chapter describes the GNU History library, a programming tool that
+provides a consistent user interface for recalling lines of previously
+typed input.
+
+@menu
+* Introduction to History::	What is the GNU History library for?
+* History Interaction::		What it feels like using History as a user.
+@end menu
+
+@node Introduction to History, History Interaction, History Top, Top
+@appendixsec Introduction to History
+
+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 History Interaction, , Introduction to History, Top
+@appendixsec History Interaction
+@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, , History Interaction
+@appendixsubsec Event Designators
+@cindex event designators
+
+An event designator is a reference to a command line entry in the
+history list.
+
+@table @asis
+
+@item @code{!}
+Start a history subsititution, except when followed by a space, tab, or
+the end of the line... @key{=} or @key{(}.
+
+@item @code{!!}
+Refer to the previous command.  This is a synonym for @code{!-1}.
+
+@item @code{!n}
+Refer to command line @var{n}.
+
+@item @code{!-n}
+Refer to the command line @var{n} lines back.
+
+@item @code{!string}
+Refer to the most recent command starting with @var{string}.
+
+@item @code{!?string}[@code{?}]
+Refer to the most recent command containing @var{string}.
+
+@end table
+
+@node Word Designators, Modifiers, Event Designators, History Interaction
+@appendixsubsec 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 @code
+
+@item 0 (zero)
+The zero'th word.  For many applications, this is the command word.
+
+@item n
+The @var{n}'th word.
+
+@item ^
+The first argument.  that is, word 1.
+
+@item $
+The last argument.
+
+@item %
+The word matched by the most recent @code{?string?} search.
+
+@item x-y
+A range of words; @code{-@var{y}} Abbreviates @code{0-@var{y}}.
+
+@item *
+All of the words, excepting the zero'th.  This is a synonym for @code{1-$}.
+It is not an error to use @key{*} if there is just one word in the event.
+The empty string is returned in that case.
+
+@end table
+
+@node Modifiers, , Word Designators, History Interaction
+@appendixsubsec 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 @samp{.}@var{suffix}, leaving the basename.
+
+@item e
+Remove all but the suffix.
+
+@item t
+Remove all leading  pathname  components, 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