backlight

#!/bin/sh
max=$(cat /sys/class/backlight/*/max_brightness)
current=$(cat /sys/class/backlight/*/brightness)

if [ "$1" == + ]
	then
		if [ $current == $max ]
			then
				notify-send -t 1000 "Brightness maxed"
			else
				let current=$current+1
				echo $current | sudo tee /sys/class/backlight/*/brightness
				notify-send -t 1000 "Brightness is now set at $current"
		fi
fi
if [ "$1" == - ]
	then
		if [ $current == 0 ]
			then
				notify-send -t 1000 "Brightness already as low as it can. How are you seeing this"
			else
				let current=$current-1
				echo $current | sudo tee /sys/class/backlight/*/brightness
				notify-send -t 1000 "Brightness is now set at $current"
		fi
fi

if [ "$1" == high ]
	then
		echo $max | sudo tee /sys/class/backlight/*/brightness
		notify-send -t 1000 "Brightness maxed"
fi

if [ "$1" == low ]
	then
        	low=$(echo $(( $max / 10 )))
		echo $low | sudo tee /sys/class/backlight/*/brightness
		notify-send -t 1000 "Brightness set to $low"
fi



echo "This is a simple script to change the backlight. Pass + to increase brightness by 1, - to decrease brightness by 1, high to max brightness, and low to put to 10%."