#!/bin/bash

 for year in 2007 2008 2009 2010; do
   for month in 01 02 03 04 05 06 07 08 09 10 11 12; do
     log_file=${year}/${year}-${month}.log
	 echo ${log_file}
	 if[ -f ${log_file}] then
		echo ${log_file};
   done
 done