Shell script to update namecheap.com dynamic dns for a domain with your external IP address every certain minutes

namecheap-ddns.sh

#!/bin/bash

# Shell script to update Namecheap.com dynamic DNS
# for a domain to your external IP address

# Configuration - replace these with your details or read from a secure location
HOSTNAME=yoursubdomain
DOMAIN=yourdomainname.com
PASSWORD=y0urp455w0rd

# Check if curl is installed
if ! command -v curl &> /dev/null; then
    echo "curl could not be found, please install it first."
    exit 1
fi

# Fetch the current external IP address
IP=$(curl -s ipecho.net/plain)

if [ -z "$IP" ]; then
    echo "Failed to obtain external IP address."
    exit 1
fi

# Update DNS record
UPDATE_URL="https://dynamicdns.park-your-domain.com/update?host=$HOSTNAME&domain=$DOMAIN&password=$PASSWORD&ip=$IP"
RESPONSE=$(curl -s "$UPDATE_URL")

# Log response
echo "Update response: $RESPONSE"

# Check if the update was successful
if echo "$RESPONSE" | grep -q "200 Success"; then
    echo "DNS update successful."
else
    echo "DNS update failed."
    exit 1
fi