A simple CLI tool that periodically tries to ping google.com (or the host provided) and displays a notification once the server is reachable.
On Mac OS, a Growl notification is displayed if the
gntp package is available (
pip install gntp).
If not, then a Cocoa dialog is shown instead.
1. When you want to know when you are back online (`cn`). 2. When you are restarting a server and want to know when it's up again (`cn server`).