concat a b {c d e} {f {g h}}
will return
a b c d e f {g h}
as its result, and
concat " a b {c " d " e} f"
will return
a b {c d e} f
as its result.
If no args are supplied, the result is an empty string.
Copyright © 1993 The Regents of the University of California. Copyright © 1994-1996 Sun Microsystems, Inc. Copyright © 1995-1997 Roger E. Critchlow Jr.