Disable networking/internet from command line on a Mac
If you want to quickly disable internet/networking to test offline features. Doing it frequently with System preferences GUI is quite a slow workflow.
Here is the command to disable your ethernet quickly.
**sudo ifconfig en0 down**
to activate it again
**sudo ifconfig en0 up**
If you are connected via wireless you can disable it with
**networksetup -setairportpower en1 off**
to activate it again, use
**networksetup -setairportpower en1 on**
en0 and en1 are device name, which you can get from running the following command
**networksetup -listallhardwareports**