Yum update notification script

#!/bin/bash
EMAIL="naven@domain.com"
rm -f /tmp/alert
tail /var/log/yum.log > /tmp/alert
diff /opt/orig /tmp/alert
if [ $? -ne 0 ]; then

#Send alert email
echo "please check /var/log/yum.log"| /bin/mail -s "Packages update notification from `hostname` -- ( IP- Addess )" ${EMAIL}
tail /var/log/yum.log > /opt/orig
fi