#!/bin/bash
#
# A script to allow brightness control.
#

DEV=/sys/class/backlight/intel_backlight
STEP=$(($(< $DEV/max_brightness)/20))

case $1 in
    down) echo $(($(< $DEV/brightness) - $STEP)) > $DEV/brightness;;
    up) echo $(($(< $DEV/brightness) + $STEP)) > $DEV/brightness;;
esac