# detects if IP behinds the dns has changed
new_ip_addr=''
old_ip_addr=''

while(true);
do
	new_ip_addr=`nslookup example.com | grep Address | tail -1 | awk '{print $2}'`;
	echo $new_ip_addr;
    if [ $new_ip_addr!==$old_ip_addr ];
    then
    	echo `date` $new_ip_addr;

    	# making old and new ip same
    	old_ip_addr=$new_ip_addr
    	echo $new_ip_addr;
    	echo $old_ip_addr;
    fi

	 sleep 5;
done