[Live-demo] Testing ports in use

[Alex Mandel]

Since Hamish asked on IRC and I thought it would be useful to others:
sudo netstat -lptn will list what ports are in use by what application
and what address they are listening on.
For some apps however you will only see java or python listed.
This is really useful for seeing if an application is already running on
the port before launching something else that might use the same port.

Enjoy,
Alex