###Go to the folder which contains log files
cd /root/Desktop/Scripts/logs
ls -lt > /root/Desktop/Scripts/logdate.txt


###Filtering the files with date
cat /root/Desktop/Scripts/logdate.txt | cut -d" " -f8  | sed  "/^$/d" > /root/Desktop/Scripts/date.txt


###Filtering the files with filename it will be usefull in the end
cat /root/Desktop/Scripts/logdate.txt | cut -d" " -f10  | sed  "/^$/d" > /root/Desktop/Scripts/filename.txt


a=`cat /root/Desktop/Scripts/date.txt`
b=`date | cut -d" " -f4`
for i in $a
do
##Comparing todays date with the files date and if it is lesserthan equal to 3 do the condition
if [ $(echo $b-$i | bc) -le 3  ]
then
logfile=`cat /root/Desktop/Scripts/filename.txt | sed -n '1p'`
##file is last modified with in last 3 days then zip the file
zip -9 ../$logfile.zip /root/Desktop/Scripts/logs/$logfile 
sed -i '1d' /root/Desktop/Scripts/filename.txt
else
##if the file is modified before 4 days or more delete it
logfile=`cat ../filename.txt | sed -n '1p'`
rm -rf $logfile
sed -i '1d' /root/Desktop/Scripts/filename.txt
fi
done
echo "Log file script runs successfully" | mail -s "script runs successfully" xyz@gmail.com

0 1 * * * /bin/sh /root/Desktop/Scripts/script.sh