1	#!/bin/sh
     2	opath=$PATH
     3	PATH=/bin:/usr/bin
     4	case $# in
     5	0)	echo 'Usage: which ' 1>&2; exit 2
     6	esac
     7	for i in `echo $opath | sed 's/^:/.:/
     8				    s/::/:.:/g
     9				    s/:$/:./
    10				    s/:/ /g'`
    11	do
    12	#	echo $i/$1
    13		if test -f $i/$1
    14		then
    15			echo $i/$1
    16			exit 0  # found
    17		fi
    18	done
    19	exit 1  #not found