Someone

#!/bin/sh

# Gzip and move the biggest 3 mailboxes in /var/mail

cd /var/mail

du -sh * | perl -ne 'if(/\dG/){print}' | sort -rn | head > /tmp/mail.tmp
du -sh * | perl -ne 'if(/\dM/){print}' | sort -rn | head >> /tmp/mail.tmp
                    
echo "These are the guys we're moving:"
head -3 /tmp/mail.tmp
echo

head -3 /tmp/mail.tmp | awk '{print $2}' > /tmp/mail.tmp

for i in `cat /tmp/mail.tmp`
do            
        gzip -c $i > /usr/home/$i/mbox.`date "+%Y%m%d"`.gz
        rm $i
done    

rm /tmp/mail.tmp