#!/bin/rc
#
#	sdiff: find difference between two system
#	sdiff is mainly designed to look difference
#	between /n/sources and our system.
#
#	therefore uid and gid parts are neglected in comparison.
#
#	usage: sdiff /n/sources/plan9 / sys/src/9/pc
#
#	usage: sdiff /n/sources/plan9 / sys/src/9/pc/sd53c8xx.i
#
p=''
switch($#*){
case 2
	;
case 3
	p=$3
	if(! ~ $p /*)
		p=/$p
case *
	echo 'usage: dir1 dir2 [path]'
	exit usage
}

d1=$1$p
d2=$2$p
f=()
if(! test -e $d1){
	echo $d1 is not exist
	f=1
}
if(! test -e $d2){
	echo $d2 is not exist
	f=1
}
if(~ $f 1)
	exit error

fn dls { ls -lp $1 | awk '{print $1, $6, $7, $8, $9, $10}'}
if (test -d $d2)
	diff <{dls $d1} <{dls $d2} 
if not
	diff $d1 $d2