#!/bin/bash echo on > /proc/acpi/ibm/light sleep 0.2 echo off > /proc/acpi/ibm/light sleep 0.2 echo on > /proc/acpi/ibm/light sleep 0.2 echo off > /proc/acpi/ibm/light sleep 0.2 echo on > /proc/acpi/ibm/light sleep 0.2 echo off > /proc/acpi/ibm/light