Execution example::

  % groonga -c
  > status
  [[0,1332486613.4953,9.918212890625e-05],{"alloc_count":130,"starttime":1332486613,"uptime":0,"version":"2.0.0-250-g5a3cf19","n_queries":0,"cache_hit_rate":0.0,"command_version":1,"default_command_version":1,"max_command_version":2}]
  > ctrl-d
  %