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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH history n "" Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-history \- Manipulate the history list
-.SH SYNOPSIS
-\fBhistory \fR?\fIoption\fR? ?\fIarg arg ...\fR?
-.BE
-.SH DESCRIPTION
-.PP
-The \fBhistory\fR command performs one of several operations related to
-recently-executed commands recorded in a history list.  Each of
-these recorded commands is referred to as an
-.QW event .
-When specifying an event to the \fBhistory\fR command, the following
-forms may be used:
-.IP [1]
-A number:  if positive, it refers to the event with
-that number (all events are numbered starting at 1).  If the number
-is negative, it selects an event relative to the current event
-(\fB\-1\fR refers to the previous event, \fB\-2\fR to the one before that, and
-so on).  Event \fB0\fR refers to the current event.
-.IP [2]
-A string:  selects the most recent event that matches the string.
-An event is considered to match the string either if the string is
-the same as the first characters of the event, or if the string
-matches the event in the sense of the \fBstring match\fR command.
-.PP
-The \fBhistory\fR command can take any of the following forms:
-.TP
-\fBhistory\fR
-Same
-as \fBhistory info\fR, described below.
-.TP
-\fBhistory add\fI command \fR?\fBexec\fR?
-Adds the \fIcommand\fR argument to the history list as a new event.  If
-\fBexec\fR is specified (or abbreviated) then the command is also
-executed and its result is returned.  If \fBexec\fR is not specified
-then an empty string is returned as result.
-.TP
-\fBhistory change\fI newValue\fR ?\fIevent\fR?
-Replaces the value recorded for an event with \fInewValue\fR.  \fIEvent\fR
-specifies the event to replace, and
-defaults to the \fIcurrent\fR event (not event \fB\-1\fR).  This command
-is intended for use in commands that implement new forms of history
-substitution and wish to replace the current event (which invokes the
-substitution) with the command created through substitution.  The return
-value is an empty string.
-.TP
-\fBhistory clear\fR
-Erase the history list.  The current keep limit is retained.
-The history event numbers are reset.
-.TP
-\fBhistory event\fR ?\fIevent\fR?
-Returns the value of the event given by \fIevent\fR.  \fIEvent\fR
-defaults to \fB\-1\fR.
-.TP
-\fBhistory info \fR?\fIcount\fR?
-Returns a formatted string (intended for humans to read) giving
-the event number and contents for each of the events in the history
-list except the current event.  If \fIcount\fR is specified
-then only the most recent \fIcount\fR events are returned.
-.TP
-\fBhistory keep \fR?\fIcount\fR?
-This command may be used to change the size of the history list to
-\fIcount\fR events.  Initially, 20 events are retained in the history
-list.  If \fIcount\fR is not specified, the current keep limit is returned.
-.TP
-\fBhistory nextid\fR
-Returns the number of the next event to be recorded
-in the history list.  It is useful for things like printing the
-event number in command-line prompts.
-.TP
-\fBhistory redo \fR?\fIevent\fR?
-Re-executes the command indicated by \fIevent\fR and returns its result.
-\fIEvent\fR defaults to \fB\-1\fR.  This command results in history
-revision:  see below for details.
-.SH "HISTORY REVISION"
-.PP
-Pre-8.0 Tcl had a complex history revision mechanism.
-The current mechanism is more limited, and the old
-history operations \fBsubstitute\fR and \fBwords\fR have been removed.
-(As a consolation, the \fBclear\fR operation was added.)
-.PP
-The history option \fBredo\fR results in much simpler
-.QW "history revision" .
-When this option is invoked then the most recent event
-is modified to eliminate the history command and replace it with
-the result of the history command.
-If you want to redo an event without modifying history, then use
-the \fBevent\fR operation to retrieve some event,
-and the \fBadd\fR operation to add it to history and execute it.
-.SH KEYWORDS
-event, history, record