Set Automatic Proxy Configuration through Command line in OS X 10.7

It took me a while to find it, but to set the Automatic Proxy Configuration url and tick the box through command line I found this helpful post which describes a script on how to do it.

First you need to find which network interface you want to change:

networksetup -listallnetworkservices
Ethernet

Use this in the command:

networksetup -setautoproxyurl Ethernet http://wpad.your.path.here/wpad.dat

By adding a url it automatically switches it on. To check:

networksetup -getautoproxyurl Ethernet

Simples. Don't know why it took me so long to find it. Don't think it's in the man page for networksetup for some reason!