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- append varName value ?value value ...?
- 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.
-