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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 <kennykb@acm.org>. All rights reserved.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
.TH lappend n "" Tcl "Tcl Built-In Commands"
.so man.macros
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
lappend \- Append list elements onto a variable
.SH SYNOPSIS
\fBlappend \fIvarName \fR?\fIvalue value value ...\fR?
.BE
.SH DESCRIPTION
.PP
This command treats the variable given by \fIvarName\fR as a list
and appends each of the \fIvalue\fR arguments to that list as a separate
element, with spaces between elements.
If \fIvarName\fR does not exist, it is created as a list with elements
given by the \fIvalue\fR arguments.
.VS TIP508
If \fIvarName\fR indicate an element that does not exist of an array that has
a default value set, list that is comprised of the default value with all the
\fIvalue\fR arguments appended as elements will be stored in the array
element.
.VE TIP508
\fBLappend\fR is similar to \fBappend\fR except that the \fIvalue\fRs
are appended as list elements rather than raw text.
This command provides a relatively efficient way to build up
large lists. For example,
.QW "\fBlappend a $b\fR"
is much more efficient than
.QW "\fBset a [concat $a [list $b]]\fR"
when \fB$a\fR is long.
.SH EXAMPLE
.PP
Using \fBlappend\fR to build up a list of numbers.
.PP
.CS
% set var 1
1
% \fBlappend\fR var 2
1 2
% \fBlappend\fR var 3 4 5
1 2 3 4 5
.CE
.SH "SEE ALSO"
list(n), lassign(n), lindex(n), linsert(n), llength(n),
lmap(n), lpop(n), lrange(n), lremove(n), lrepeat(n), lreplace(n),
lreverse(n), lsearch(n), lset(n), lsort(n)
.SH KEYWORDS
append, element, list, variable
.\" Local variables:
.\" mode: nroff
.\" fill-column: 78
.\" End:
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