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'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\" Copyright (c) 2001 Kevin B. Kenny. All rights reserved.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
'\" RCS: @(#) $Id: lreplace.n,v 1.15 2007/10/26 20:11:53 dgp Exp $
'\"
.so man.macros
.TH lreplace n 7.4 Tcl "Tcl Built-In Commands"
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
lreplace \- Replace elements in a list with new elements
.SH SYNOPSIS
\fBlreplace \fIlist first last \fR?\fIelement element ...\fR?
.BE
.SH DESCRIPTION
.PP
\fBlreplace\fR returns a new list formed by replacing one or more elements of
\fIlist\fR with the \fIelement\fR arguments.
.VS 8.5
\fIfirst\fR and \fIlast\fR are index values specifying the first and
last elements of the range to replace.
The index values \fIfirst\fR and \fIlast\fR are interpreted
the same as index values for the command \fBstring index\fR,
supporting simple index arithmetic and indices relative to the
end of the list.
0 refers to the first element of the
list, and \fBend\fR refers to the last element of the list.
If \fIlist\fR is empty, then \fIfirst\fR and \fIlast\fR are ignored.
.VE
If \fIfirst\fR is less than zero, it is considered to refer to the
first element of the list. For non-empty lists, the element indicated
by \fIfirst\fR must exist.
If \fIlast\fR is less than zero but greater than \fIfirst\fR, then any
specified elements will be prepended to the list. If \fIlast\fR is
less than \fIfirst\fR then no elements are deleted; the new elements
are simply inserted before \fIfirst\fR.
The \fIelement\fR arguments specify zero or more new arguments to
be added to the list in place of those that were deleted.
Each \fIelement\fR argument will become a separate element of
the list. If no \fIelement\fR arguments are specified, then the elements
between \fIfirst\fR and \fIlast\fR are simply deleted. If \fIlist\fR
is empty, any \fIelement\fR arguments are added to the end of the list.
.SH EXAMPLES
Replacing an element of a list with another:
.CS
% \fBlreplace\fR {a b c d e} 1 1 foo
a foo c d e
.CE
.PP
Replacing two elements of a list with three:
.CS
% \fBlreplace\fR {a b c d e} 1 2 three more elements
a three more elements d e
.CE
.PP
Deleting the last element from a list in a variable:
.CS
% set var {a b c d e}
a b c d e
% set var [\fBlreplace\fR $var end end]
a b c d
.CE
.SH "SEE ALSO"
list(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n),
lset(n), lrange(n), lsort(n),
.VS 8.5
string(n)
.VE
.SH KEYWORDS
element, list, replace
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