#!/bin/bash
## form the intersection of 2 files;  Eugene Reimer  2010-04;
## for files that are set-like / uniquified, but need not be sorted  (for sorted files using join or comm may be slightly faster):
## see also:  SetUnion  SetSubtract;
##
## These and other useful one-liners are found in:  http://www.pixelbeat.org/cmdline.html
##	SetUnion:	  sort "$1" "$2"      |uniq
##	SetIntersection:  sort "$1" "$2"      |uniq -d
##	SetSubtract:	  sort "$1" "$2" "$2" |uniq -u		##note: his SetDifference has $1, $2 reversed to my way of thinking

sort "$1" "$2" |uniq -d