concat(3tcl) Tcl Built-In Commands concat(3tcl)
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NAME
concat - Join lists together
SYNOPSIS
concat ?arg arg ...?
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DESCRIPTION
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 ig-
nored entirely. It permits any number of arguments; if no args are
supplied, the result is an empty string.
EXAMPLES
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).
SEE ALSO
append(3tcl), eval(3tcl), join(3tcl)
KEYWORDS
concatenate, join, list
Tcl 8.3 concat(3tcl)
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