append tcl

Overview

Append to variable

Syntax

append varName value ?value value ...?

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 arguments. 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