concat (3)
NAME
concat - Join lists togetherSYNOPSIS
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 of 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, flattening them in the process (so giving the following interactive session):
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% 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:
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% 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:
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% 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).