What model switch are you working with? Usually just issuing the command # no shutdown, will bring the port back up. 
Well this is awesome. I somehow managed to bump "sh" and then "enter" when I was in the config section for a port... and it shut the port down. I've tried "Set interface active ethernet 1/eXX", no luck. It accepts the command, but it's still down. I've searched and not found other options.  Is there something I'm missing?
Port down...