Execution example::

  % groonga -c
  > status
  [
    [
      0, 
      1335519662.04579, 
      5.79357147216797e-05
    ], 
    {
      "uptime": 0, 
      "max_command_version": 2, 
      "n_queries": 0, 
      "cache_hit_rate": 0.0, 
      "version": "2.0.1-283-g3f815e2", 
      "alloc_count": 130, 
      "command_version": 1, 
      "starttime": 1335519662, 
      "default_command_version": 1
    }
  ]
  > ctrl-d
  %