#!/bin/rc rfork eif(~ $#* 0){	echo 'usage: patch/remove patch-name...' >[1=2]	exit usage} if(! test -d /n/sources/patch){	rfork n	9fs sources} for(i){	if(! test -d /n/sources/patch/$i)		echo 'no such patch' /n/sources/patch/$i >[1=2]	if not		rm -rf /n/sources/patch/$i}