concat

Section: Tcl Built-In Commands (n)
Updated: 8.3
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NAME

concat - Join lists together  

SYNOPSIS

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. 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.  

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(n), eval(n), join(n)  

KEYWORDS

concatenate, join, list


 

Index

NAME
SYNOPSIS
DESCRIPTION
EXAMPLES
SEE ALSO
KEYWORDS
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