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, lindex, linsert, llength, lset, lsort, lrange
append, element, list, variable
Copyright © 1993 The Regents of the University of
California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 2001 Kevin B. Kenny <kennykb(at)acm.org>. All
rights reserved.