Update a record in a DNS Zone hosted at Digital Ocean

ipUpdater.sh

#!/bin/bash

#################### CHANGE THE FOLLOWING VARIABLES ####################
TOKEN="" // Digital Ocean API Token
DOMAIN="" // Domain Name
RECORD_ID="" // DO Assigned each record in a Zone file an ID. To update a record you need that ID.
LOG_FILE="/var/log/ips.txt"
########################################################################

CURRENT_IPV4="$(dig +short myip.opendns.com @resolver1.opendns.com)"
LAST_IPV4="$(tail -1 $LOG_FILE | awk -F, '{print $2}')"

if [ "$CURRENT_IPV4" = "$LAST_IPV4" ]; then
    logger "$0 : IP has not changed ($CURRENT_IPV4)"
else
    logger "$0 : IP has changed: $CURRENT_IPV4"
    echo "$(date),$CURRENT_IPV4" >> "$LOG_FILE"
    curl -o /dev/null -X PUT -H "Content-Type: application/json" -H "Authorization: Bearer $TOKEN" -d '{"data":"'"$CURRENT_IPV4"'"}' "https://api.digitalocean.com/v2/domains/$DOMAIN/records/$RECORD_ID"
fi