#!/bin/rcrfork e fn usage {	echo 'usage:' $0 '[ -nr ] devmask' >[1=2]	exit usage} op='&'while(~ $1 -*){	switch($1){	case -n; op='~'	case -r; op='&~'	case *; usage	}	shift} echo chdev $op $1 >> '#c/drivers'