#!/bin/rc #master file is /sys/src/cmd/bitsy/light.rc switch($1){case on	echo -n 2 1 0x80 > /dev/backlightcase off	echo -n 2 0 0x80 > /dev/backlightcase auto	echo -n 1 1 0x80 > /dev/backlightcase *	echo -n 2 1 $1 > /dev/backlight}