#!/bin/shdir_path="/vol/project/log/test/"for year in {
   2012..2013}do    #echo "$year"    cd $dir_path    mkdir $year    for month in {
   1..12}    do        #echo "$month"        month_dir="$dir_path/$year"        cd $month_dir        mkdir $month        for day in {
   1..31}        do            #echo "$day"            day_dir="$dir_path/$year/$month"            cd $day_dir            mkdir $day        done    donedone