checkonline.sh

#!/bin/bash
#
# Continuously checks online/offline status and notifies
# you when the status changes. Works only where the "say"
# command is available.
#
# Dedicated to the public domain.
#
last=

while true; do
	ping -o -t 2 www.google.de &>/dev/null
	cur=$?

	if [[ $cur != 0 ]]; then
		echo -n "0"
	else
		echo -n "1"
	fi
	if [[ $cur != $last ]]; then
		if [[ $cur != 0 ]]; then
			say "offline"
		else
			say "online"
		fi
		last=$cur
	fi
	sleep 2
done