'\"
'\" Copyright (c) 1993 The Regents of the University of California.
'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
'\"
'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\" 
'\" RCS: @(#) $Id: concat.n,v 1.1.1.1 2007/07/10 15:04:23 duncan Exp $
'\" 
.so man.macros
.TH concat n 8.3 Tcl "Tcl Built-In Commands"
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
concat \- Join lists together
.SH SYNOPSIS
\fBconcat\fI \fR?\fIarg arg ...\fR?
.BE

.SH DESCRIPTION
.PP
This command joins each of its arguments together with spaces after
trimming leading and trailing white-space from each of them.  If all the
arguments are lists, this has the same effect as concatenating them
into a single list.
It permits any number of arguments;
if no \fIarg\fRs are supplied, the result is an empty string.
.SH EXAMPLES
Although \fBconcat\fR will concatenate lists (so the command:
.CS
\fBconcat\fR a b {c d e} {f {g h}}
.CE
will return "\fBa b c d e f {g h}\fR" as its result), it will also
concatenate things that are not lists, and hence the command:
.CS
\fBconcat\fR " a b {c   " d "  e} f"
.CE
will return "\fBa b {c d e} f\fR" as its result.
.PP
Note that the concatenation does not remove spaces from the middle of
its arguments, so the command:
.CS
\fBconcat\fR "a   b   c" { d e f }
.CE
will return "\fBa   b   c d e f\fR" (i.e. with three spaces between
the \fBa\fR, the \fBb\fR and the \fBc\fR).

.SH "SEE ALSO"
append(n), eval(n)

.SH KEYWORDS
concatenate, join, lists