code: def do_up(self,args):
          
          parser = CommandArgumentParser("up")
          args = vars(parser.parse_args(args))
          if None == self.parent:
              print "You're at the root. Try 'quit' to quit"
          else:
              return True
docs: Navigate up by one level.
  
          For example, if you are in `(aws)/stack:.../asg:.../`, executing `up` will place you in `(aws)/stack:.../`.
  
          up -h for more details