log_file log_date log_time ocn year
ocn.log.150513-061207   150513    61207        1
ocn.log.150513-091002   150513    91002        5
ocn.log.150513-221940   150513   221940       20
ocn.log.150514-090150   150514    90150       35
ocn.log.150514-205141   150514   205141       50
ocn.log.150515-071745   150515    71745       65
ocn.log.150515-191542   150515   191542       80
ocn.log.150516-061252   150516    61252       95
ocn.log.150516-183624   150516   183624      110