bri

#!/bin/bash
# control brightness
# this script uses xbacklight

# Usage
# bri       -> outputs current brightness level
# bri up    -> increases brightness
# bri down  -> decreases brightness
# bri 90   -> sets brightness to 90
# bri +50   -> increases brightness by 50
# bri -10   -> decreases brightness by 10

# change this value to the number of levels you want brightness inc/dec to have
levels=5
inc=$((100/levels))

for args in "$@"; do
	case $args in
		-n) notify=true;;
		up) arg="+$inc";;
		down) arg="-$inc";;
		*) arg=$args ;;
	esac
done
if [ -n "$arg" ]; then xbacklight "$arg"; fi
nb=$(xbacklight -get)
if [ "$notify" == "true" ]; then	
	notify-send -a "bri" "Brightness" "🔆$nb%" -t 500 &
fi
echo "🔆 $nb" # display current(new if changed) brightness level