Checks if the mailqueue is empty

#!/bin/sh
#script that looks if the mailqueue is emtpy or not. if the queue is empty, nothing happens. If not an e-amil with the queue is send.
mailq > /root/temp

if [ `cat /root/temp | wc -m` -gt 4 ]
then
        #send an e-mail if the queue isn't empty
        sendmail mymail@example.com < /root/temp
fi

rm -rf /root/temp