For the full man page, see http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/append.htm
NAME append - Append to variable
SYNOPSIS append varName ?value value value ...?
DESCRIPTION Append all of the value arguments to the current value
of variable varName. If varName doesn't exist, it is
given a value equal to the concatenation of all the
value arguments. This command provides an efficient
way to build up long variables incrementally. For
example, ``append a $b'' is much more efficient than
``set a $a$b'' if $a is long.
Is the result of an append of two lists a list as you might expect it? (Peter Lewerin: Yes, because append is not lappend.)
set a [list a b c] set b [list 1 2 3] append a $b puts $a
Note that the third element of this new list is not c, but c1. Does anyone know if there are cases where an append would result in something not a list?
Here's an example of such a case:
set l1 [list a {b c}]
set l2 [list {d e} f]
append l1 $l2
llength $l1Tcl syntax help Arts and crafts of Tcl-tk programming Category Command