concat — Join lists together
concat ?arg arg ...?
This command joins each of its arguments together with spaces after
trimming leading and trailing white-space from each of them. If all
of the arguments are lists, this has the same effect as
concatenating them into a single list. Arguments that are empty
(after trimming) are ignored entirely. It permits any number of
arguments; if no args are supplied, the result is an empty
string.
Although concat will concatenate lists, flattening them in
the process (so giving the following interactive session):
% concat a b {c d e} {f {g h}}
a b c d e f {g h}
it will also concatenate things that are not lists, as can be
seen from this session:
% concat " a b {c " d " e} f"
a b {c d e} f
Note also that the concatenation does not remove spaces from the
middle of values, as can be seen here:
% concat "a b c" { d e f }
a b c d e f
(i.e., there are three spaces between each of the a, the
b and the c).
For true list concatenation, the list command should be used with
expansion of each input list:
% list {*}"a b c" {*}{ d e f }
a b c d e f
append, eval, join, list
concatenate, join, list
Copyright © 1993 The Regents of the University of
California.
Copyright © 1994-1996 Sun Microsystems, Inc.