#!/bin/sh

awk 'BEGIN {
  split("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ", months, " ")
  for (i = 1; i <= 12; i++)
      m[months[i]] = i
}{
  split($4,array,/\[|:|\//)
  year = array[4]
  month = sprintf("%02d", m[array[3]])
  day = array[2]
  hour = array[5]
  print > "access."year"-"month"-"day"-"hour".log"
}' access.log