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Man Pages
concat(n) Tcl Built-In Commands concat(n)
 

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 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.

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).

append(n), eval(n), join(n)

concatenate, join, lists
8.3 Tcl

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