Delete the ports specified with the port-identifier option.

def postOptions(self):
        """
        Delete the ports specified with the port-identifier option.
        """
        if self.portIdentifiers:
            store = self.parent.parent.getStore()
            store.transact(self._delete, store, self.portIdentifiers)
            print "Deleted."
            raise SystemExit(0)
        else:
            self.opt_help()