Monitoring whois changes for one domain

whois-change.sh

#!/bin/bash

#
# Run this script once per day
#

DOMAIN="ZHOVNER.COM"


if [ ! -f /tmp/$DOMAIN.old.whois.txt ]; then
    whois $DOMAIN | sed -e 's/^>>> Last update of whois database.*$//g' > /tmp/$DOMAIN.old.whois.txt
    exit 0
else
    whois $DOMAIN | sed -e 's/^>>> Last update of whois database.*$//g' > /tmp/$DOMAIN.new.whois.txt
    OLDFILE=$(md5sum /tmp/$DOMAIN.old.whois.txt | awk '{print $1}')
    NEWFILE=$(md5sum /tmp/$DOMAIN.new.whois.txt | awk '{print $1}')
fi

if [ "$OLDFILE" != "$NEWFILE" ]; then
    diff /tmp/$DOMAIN.new.whois.txt /tmp/$DOMAIN.old.whois.txt > /tmp/$DOMAIN.whois.diff.txt
    mail -s "Whois information of $DOMAIN changed" root < /tmp/$DOMAIN.whois.diff.txt
    mv /tmp/$DOMAIN.new.whois.txt /tmp/$DOMAIN.old.whois.txt
    rm /tmp/$DOMAIN.whois.diff.txt
else
    mv /tmp/$DOMAIN.new.whois.txt /tmp/$DOMAIN.old.whois.txt
fi