From 8.5, [expr] operator for list inclusion test. if {$el in $list} ... is equivalent to, but much nicer than if {[lsearch -exact $list $el] >= 0} ... The negation ("not in") is [ni]. So 8.5 Tcl really makes us knights who say 'ni'... For users of earlier versions, the following little helper comes in handy: proc in {list el} {expr [lsearch -exact $list $el] >= 0}} ... if [in $list $el] ... - [rs] 2007-04-26 ---- [Category Command] , well sub-command, as part of expr