append(n)

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NAME
       append - Append to variable

SYNOPSIS
       append varName ?value value value ...?
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DESCRIPTION
       Append  all of the value arguments to the current value of
       variable varName.  If varName doesn't exist, it is given a
       value  equal  to  the concatenation of all the value argu-
       ments.  This command provides an efficient way to build up
       long  variables  incrementally.   For  example, ``append a
       $b'' is much more efficient than ``set a $a$b'' if  $a  is
       long.

KEYWORDS
       append, variable