Your computer's MAC (media access control) address is an essential networking component, but also makes it possible for people to secretly track you. If you want to really prevent that from happening, blogger Jonathan Zdziarski shows off a simple bash script that will randomise your address every 30 seconds.
Zdziarski's script works in OS X, but it should be easy to adapt to other systems. Once you have it running, it will change your MAC address every 30 seconds so you can be sure nobody's tracking you. If you're less worried about trackers and would prefer to just spoof your MAC address, we've got you covered, but randomising is helpful if you're really worried that someone might be on your tail. Head to Zdziarski's site for the full script and instructions.