lappend(3Tcl)

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 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.


KEYWORDS
     append, element, list, variable