#! /bin/sh set -e screen_brightness_device_path="$1" awk ' BEGIN { OFS = msg_fs ? msg_fs : "|" Kfs = key_fs ? key_fs : ":" } FILENAME ~ "/max_brightness$" {max = $1; next} FILENAME ~ "/brightness$" {cur = $1; next} END {print("percentage", (cur / max) * 100)} ' \ "$screen_brightness_device_path/max_brightness" \ "$screen_brightness_device_path/brightness"