The man page for llength is http://purl.org/tcl/home/man/tcl8.4/TclCmd/llength.htm
This command returns the number of elements in the list. If the string is not a well-formed list, an error will be thrown.
caspian: Make sure to give llength the list, not just the name variable where the list is stored.
# This is the right way to do it.
set mylist {a b c}
llength $mylist
# This is the WRONG way to do it.
# This won't return an error, but it will always return "1",
# no matter how long or short your list is.
set mylist {a b c}
llength mylistSee also list, lappend, lindex, linsert, lrange, lreplace, lsearch, lsort .
Tcl syntax help - Arts and crafts of Tcl-Tk programming - Category Command