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lappend(n) Tcl Built-In Commands lappend(n)
 

lappend - Append list elements onto a variable

lappend varName ?value value value ...?

 

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.

Using lappend to build up a list of numbers.
% set var 1
1
%  lappend var 2
1 2
%  lappend var 3 4 5
1 2 3 4 5

list(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n), lrange(n)

append, element, list, variable
Tcl

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