Linux: How to start Skype (or other program) only when I'm online?

"Try this script. It uses a ping test to determine whether you're online, launches Skype if you are and warns you if you're not:

#!/bin/bash

if ping -c 1 -W 5 google.com &>/dev/null;then
exec skype
else
echo ""No Internet connectivity. Bailing...""
exit 1
fi"