log_file log_date log_time ocn year
ocn.log.140522-075258   140522    75258        1
ocn.log.140523-080547   140523    80547        4
ocn.log.140523-141705   140523   141705        7
ocn.log.140523-200148   140523   200148       10
ocn.log.141106-044930   141106    44930       13
ocn.log.141107-231636   141107   231636       16
ocn.log.141108-045937   141108    45937       19
ocn.log.141108-140405   141108   140405       22
ocn.log.141109-000019   141109       19       25