#!/bin/bash

cur_year=`date +%Y` #Current year follow by the server time, 2005
cur_month=`date +%b` #Current month follow by the server time, Dec

month_01='01' #Numeric variable assign to month
month_02='02'
month_03='03'
month_04='04'
month_05='05'
month_06='06'
month_07='07'
month_08='08'
month_09='09'
month_10='10'
month_11='11'
month_12='12'

interval='3' #Rototion in month before a DN report will be removed

for name in /home/cyzie/bash/hd1/DNReport/*/*
do
   bname=$(basename $name)
   fname_year=${bname:11:4}
   fname_month=${bname:8:3}

   bal_year=`expr $cur_year - $fname_year` #Difference year between current year and file name year
   echo balance year is $bal_year
   dif_month=`expr 12 \* $bal_year` #Calculate the total diffence year
   echo dif month is $dif_month

   dif_month=`expr 12 \* $bal_year` #Calculate the total diffence year
   dif_month=`expr 12 \* $bal_year` #Calculate the total diffence year
   case $fname_month in #Convert character type to numeric type for file name month
      Jan) num_fmonth=$month_01;;
      Feb) num_fmonth=$month_02;;
      Mac) num_fmonth=$month_03;;
      Apr) num_fmonth=$month_04;;
      May) num_fmonth=$month_05;;
      Jun) num_fmonth=$month_06;;
      Jul) num_fmonth=$month_07;;      Aug) num_fmonth=$month_08;;
      Sep) num_fmonth=$month_09;;
      Oct) num_fmonth=$month_10;;
      Nov) num_fmonth=$month_11;;
      Dec) num_fmonth=$month_12;;
   esac

   case $cur_month in #Convert character type to numeric type for current month
      Jan) num_cmonth=$month_01;;
      Feb) num_cmonth=$month_02;;
      Mac) num_cmonth=$month_03;;
      Apr) num_cmonth=$month_04;;
      May) num_cmonth=$month_05;;
      Jun) num_cmonth=$month_06;;
      Jul) num_cmonth=$month_07;;
      Aug) num_cmonth=$month_08;;
      Sep) num_cmonth=$month_09;;
      Oct) num_cmonth=$month_10;;
      Nov) num_cmonth=$month_11;;
      Dec) num_cmonth=$month_12;;
    esac


    if [ "$dif_month" -eq "0" ] #Comparation of the duration year
    then
       duration=`expr $num_cmonth - $num_fmonth`

    elif [ $dif_month -gt 0 ]
    then
       cur_duration=`expr $dif_month - $num_fmonth`
       duration=`expr $cur_duration + $num_cmonth`
    else
       echo ""
    fi

    if [ $duration -gt $interval ]
    then
       rm -rf $name
    fi

    echo ok
done