#!/bin/bash # # Raspberry Pi flash LED on successful boot. # # Define variables i=0 # Export pins if [ ! -e /sys/class/gpio/gpio12 ]; then echo "12" > /sys/class/gpio/export fi # Set pins as input/output echo "out" > /sys/class/gpio/gpio12/direction # Flash LED 4 times while [ $i -lt 4 ]; do echo "1" > /sys/class/gpio/gpio12/value sleep 0.5s echo "0" > /sys/class/gpio/gpio12/value sleep 0.5s (( i++ )) done