#!/bin/bash
case $1 in
	"set")  printf %0.f $( echo "scale=0; $2 * 9.37" | bc -l ) > /sys/class/backlight/intel_backlight/brightness;;
	"add")	current=$( </sys/class/backlight/intel_backlight/brightness )
		new=$( printf %.0f $(echo "$current + $2 * 9.37" | bc -l ) )
		[ $new -gt 936 ] && bright set 937 || ( [ $new -lt 0 ] && bright set 0 || bright set "$(( new + 1 ))" ) ;;
	"del")	bright add "-$2";;
esac