def get_machines(fields={}, less=[])
      list = get_metadata Rudy::Machines, fields, less
      if list.empty?
        if @@global.position.nil?
          raise Rudy::MachineGroupNotRunning, (@option.all ? nil : current_machine_group)
        else
          raise Rudy::MachineNotRunning, current_machine_name 
        end
      end
      list
    end
def get_machines(fields={}, less=[])
      list = get_metadata Rudy::Machines, fields, less
      if list.empty?
        if @@global.position.nil?
          raise Rudy::MachineGroupNotRunning, (@option.all ? nil : current_machine_group)
        else
          raise Rudy::MachineNotRunning, current_machine_name 
        end
      end
      list
    end
See get_metadata