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- lappend varName value ?value value ...?
- Treat the variable given by varName as a list and
- append each of the value arguments to that list as a
- separate element, with spaces between elements. If
- varName doesn't exist, it is created as a list with
- elements given by the value arguments. Lappend is
- similar to append except that the values are appended
- as list elements rather than raw text. This command
- provides a relatively efficient way to build up large
- lists. For example, ``lappend a $b'' is much more
- efficient than ``set a [concat $a [list $b]]'' when $a
- is long.
-