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. If varName indicate an element that
does not exist of an array that has a default value set, list that
is comprised of the default value with all the value
arguments appended as elements will be stored in the array element.
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, lassign, ledit, lindex, linsert, llength, lmap, lpop, lrange, lremove, lrepeat, lreplace, lreverse, lsearch, lseq, lset, lsort
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.