#!/usr/bin/env bash set_brightness() { echo "${1}" > /sys/class/leds/led0/brightness } check_status_loop() { while true ; do if wget --quiet localhost:8069/hw_proxy/hello -O /dev/null ; then set_brightness 255 else set_brightness 0 fi sleep 5 done } echo none > /sys/class/leds/led0/trigger check_status_loop