lappend
Name
lappend — Append list elements onto a variable
Synopsis
lappend varName ?
value value value ...?
Description
This command treats the variable given by
varName as a list and appends each of the
value arguments to that list as a separate element, with spaces between elements. If
varName does not 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.
Example
Using
lappend to build up a list of numbers.
% set var 1
1
% lappend
