Simple Cloudflare DDNS Shell Script

ddns.sh

#!/bin/sh
#
# set -x

DOMAIN_NAME="<Domain name>"

IP_RECORD=`nslookup -type=a $DOMAIN_NAME | tail -n+4 | grep Address | sed -e '/^$/d' -e 's/Address: //g'`
IP_CURRENT=`curl -s ip.sb`

ZONE_IDENTIFIER=
DNS_IDENTIFIER=
API_TOKEN=

if [ $IP_RECORD != $IP_CURRENT ]; then
        echo -e "Change DNS record to ${IP_CURRENT}."
        curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/${ZONE_IDENTIFIER}/dns_records/${DNS_IDENTIFIER}" \
                -H "Authorization: Bearer ${API_TOKEN}" \
                -H "Content-Type: application/json" \
                --data "{\"type\":\"A\",\"name\":\"${DOMAIN_NAME}\",\"content\":\"${IP_CURRENT}\",\"ttl\":1,\"proxied\":false}"
else
        echo -e "Everything is under control, bro."
fi