Script bash per eliminare log di JBoss superiori ad un certo numero di giorni

#!/bin/bash
#deljbosslog.sh
#Author: Predator1987
#Description: This script delete the log of JBoss antecedents number_days from today.
#Usage: First edit the variables number_days and jboss_logPath 
#	then run script as a cronjob in crontab.
#A special thanks to Nathan Coulter for its date-calc.sh
 
number_days=5 # Number of days that keeps logs 
jboss_logPath=/usr/local/jboss-4.2.3.GA/server/default/log/ # Path of directory log of JBoss
 
daysBetweenTwoDate(){
	MPHR=60     # Minutes per hour.
	HPD=24      # Hours per day.
	diff () {
      	  printf '%s' $(( $(date -u -d"$TARGET" +%s) - $(date -u -d"$CURRENT" +%s)))
	}
	CURRENT=$(date -u -d $1 '+%F')
	TARGET=$(date -u '+%F')
	DAYS=$(( $(diff) / $MPHR / $MPHR / $HPD )) 
	return $DAYS
}
 
if [ ! -d "$jboss_logPath" ]; then
  echo jboss_logPath does not exist as a valid directory : $jboss_logPath
  exit 1
fi
 
for i in $( ls $jboss_logPath | grep server.log. | sed s/server.log.//); 
	do
		daysBetweenTwoDate "$i"
           	if [ $DAYS -gt $number_days ]; then
			rm $jboss_logPath/server.log.$i
		fi
        done
exit 0