lappend - Append list elements onto a variable
lappend varName ?value value value ...?
lappend(1t) Tcl Built-In Commands lappend(1t)
______________________________________________________________________________
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 var 2
1 2
% lappend var 3 4 5
1 2 3 4 5
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------+
|Availability | runtime/tcl-8 |
+---------------+------------------+
|Stability | Uncommitted |
+---------------+------------------+
SEE ALSO
list(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n),
lrange(n)
KEYWORDS
append, element, list, variable
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from http://prdownloads.sourceforge.net/tcl/tcl-
core8.6.7-src.tar.gz.
Further information about this software can be found on the open source
community website at https://www.tcl.tk/.
Tcl lappend(1t)