log_file log_date log_time ocn year
ocn.log.151205-133648   151205   133648        0
ocn.log.151205-173809   151205   173809        0
ocn.log.151205-213858   151205   213858        1
ocn.log.151206-013516   151206    13516        1
ocn.log.151206-053131   151206    53131        2
ocn.log.151206-092751   151206    92751        2
ocn.log.151206-132718   151206   132718        3
ocn.log.151206-173040   151206   173040        3
ocn.log.151206-212940   151206   212940        4
ocn.log.151207-012652   151207    12652        4
ocn.log.151207-052350   151207    52350        5
ocn.log.151207-092357   151207    92357        5