code: def nas_command(f):
      
  
      @functools.wraps(f)
      def func_wrapper(self, *argv, **kwargs):
          commands = f(self, *argv, **kwargs)
          return self.ssh_execute(['env', 'NAS_DB=/nas'] + commands)
  
      return func_wrapper
docs: indicate it's a command of nas command run with ssh
  
      :param f: function that returns the command in list
      :return: command execution result