#!/bin/bash DEV=/sys/class/backlight/backlight BL=$(cat $DEV/brightness) MAX=$(cat $DEV/max_brightness) if [ $BL -lt 5 ]; then BL=$((BL + 1)) else BL=$((BL + ( BL / 4 ))) fi if [ $BL -gt $MAX ]; then BL=$MAX fi echo $BL > $DEV/brightness
