#!/bin/bash
MYIP="1.1.1.9"
KEY=ddns.key
NS=ns.commoninternet.net
DOMAIN=test2.time.commoninternet.net.
ZONE=time.commoninternet.net
nsupdate -k $KEY -v << EOF
server $NS
zone $ZONE
update delete $DOMAIN A
update add $DOMAIN 30 A $MYIP
send
EOF