Tcl Built-In Commands - concat manual page

### NAME

concat - Join lists together

### SYNOPSIS

concat ?arg arg ...?

### DESCRIPTION

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 args are supplied, the result is an empty string.

### EXAMPLES

Although concat will concatenate lists (so the command:

    concat a b {c d e} {f {g h}}

will return "a b c d e f {g h}" as its result), it will also concatenate things that are not lists, and hence the command:

    concat " a b {c   " d "  e} f"

will return "a b {c d e} f" as its result.

Note that the concatenation does not remove spaces from the middle of its arguments, so the command:

    concat "a   b   c" { d e f }

will return "a b c d e f" (i.e. with three spaces between the a, the b and the c).

### SEE ALSO

append, eval

### KEYWORDS

concatenate, join, lists

    Copyright © 1993 The Regents of the University of California.
    Copyright © 1994-1996 Sun Microsystems, Inc.
    Copyright © 1995-1997 Roger E. Critchlow Jr.