Simple quick script to run to alert me if the IP address of a DNS record has changed

ip-change-notification.sh

#!/bin/bash

# This script requires 3 environment variables defined:
# IP_CHANGE_DOMAIN the domain to check for an IP address change
# PUSHOVER_TOKEN the application token for PushOver
# PUSHOVER_USER the user key to send notification to

echo $(date) "Checking IP of $IP_CHANGE_DOMAIN from DNS..."
DOMAIN_IP=$(dig +short ${IP_CHANGE_DOMAIN})
echo $(date) $DOMAIN_IP

echo $(date) "Checking IP of host running this script..."
IP=$(curl -s https://icanhazip.com)
echo $(date) $IP

if [ $DOMAIN_IP == $IP ]
then
    echo $(date) "IP addresses match, nothing to report..."
else
    echo $(date) "IP addresses do not match, sending PushOver notification..."

    RESULT=$(curl -s --request POST \
        --url https://api.pushover.net/1/messages.json \
        --header 'Content-Type: application/json' \
        --data '{
            "token": "'$PUSHOVER_TOKEN'",
            "user": "'$PUSHOVER_USER'",
            "message": "The IP address for '$IP_CHANGE_DOMAIN' has changed, it is now '$IP'"
        }')

    echo $(date) $RESULT
fi