How to turn USB power on/off (Arduino Yun)

Eventually I want to be able to control a lamp or a power outlet using a 5V relay switch, but while I don’t have one I thought about using the USB port (SEE ATTACHMENT) as kind of a power outlet (a USB lamp for example). How can I turn USB power on/off for that port using the command line?

Thanks!

How can I turn USB power on/off for that port

Have you looked at the schematic? Have you seen that the USB port supplies power? Have you seen a switch for that power?

using the command line?

You assume that you can. That amuses me.

Uoww... I'm sorry to have asked the question Mr. Know it All. No, I did not look at the schematics because I probably wouldn't know how to tell, humble web developer here. Anyway, sorry to waste your time. When I grow up I want to be as good as you. #jealous