def func(self):

        caller = self.caller

        if not self.args:
            caller.msg("Usage: @unlink <object>")
            return

        # This mimics '@link <obj> = ' which is the same as @unlink
        self.rhs = ""

        # call the @link functionality
        super(CmdUnLink, self).func()
All we need to do here is to set the right command
dataset/ETHPy150Open evennia/evennia/evennia/commands/default/building.py/CmdUnLink.func