#!/usr/bin/env sh brightness_path=/sys/class/backlight/*/brightness brightness_max_path=/sys/class/backlight/*/max_brightness if [ -f "${brightness_path}" ] then brightness="$(cat $brightness_path)" fi if [ -f "${brightness_max_path}" ] then brightness_max="$(cat /sys/class/backlight/*/max_brightness)" fi if [ -n "${brightness}" ] && [ -n "${brightness_max}" ] then level=$(echo "scale=2; $brightness / $brightness_max * 100" | bc) printf " " printf "%.0f\n" $level fi