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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 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):

 
 % 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, lists