#!/bin/bash CURRENT_BRIGHTNESS=$(xbacklight -get) bright_inc() { dunstify "Increasing Brightness" "Current Brightness: ${CURRENT_BRIGHTNESS}%" -i "display-brightness-medium-symbolic" -t 5000 -r 9991 } bright_dec() { dunstify "Decreasing Brightness" "Current Brightness: ${CURRENT_BRIGHTNESS}%" -i "display-brightness-low-symbolic" -t 5000 -r 9991 } while test $# -gt 0; do case "$1" in inc) bright_inc && exit 0 ;; dec) bright_dec && exit 0 ;; esac done