max(2,3,4,5,6,-99)
Various ways: in a loop (works for numeric and string values):
proc max list { set res [lindex $list 0] foreach element [lrange $list 1 end] { if {$element > $res} {set res $element} } set res }
By sorting (this is for numeric values only):
proc max list {lindex [lsort -real $list] end}