note Lotus1 <p>[http://search.cpan.org/~jkeenan/List-Compare-0.37/lib/List/Compare.pm|List::Compare] does exactly what you need and it is easy to use.</p> <c> @Llist = qw(abel abel baker camera delta edward fargo golfer); @Rlist = qw(baker camera delta delta edward fargo golfer hilton); $lc = List::Compare->new(\@Llist, \@Rlist); get_unique() Get those items which appear (at least once) only in the first list. @Lonly = $lc->get_unique; @Lonly = $lc->get_Lonly; # alias get_complement() Get those items which appear (at least once) only in the second list. @Ronly = $lc->get_complement; @Ronly = $lc->get_Ronly; # alias </c> 997024 997024