cron job to update dyndns with namecheap

dyndns_up.sh

#!/bin/bash
# cron job to update dyndns with namecheap

set -e

# Variables
PASSWORD="abc"
UPDATE_URL="dynamicdns.park-your-domain.com/update?host=<username>&domain=<domain>&password=<pass>&ip=<ipaddr>"

# Array of domain configurations
DOMAINS=(
    "subdomain example.com"
)

# Get current IP
CURRENT_IP=$(curl --silent  https://checkip.amazonaws.com)

echodate() {
    echo `date +"%Y-%m-%dT%H:%M:%S%z"`"$(echo -e '\t')"$*
}

# Function to update DNS record
update_dns() {
    local host=$1
    local domain=$2
    local current_ip=$3

    # Get DNS IP
    local dns_ip=$(dig +short $host.$domain)

    # Check if IP has changed
    if [ "$current_ip" != "$dns_ip" ]; then
        local update_uri=$(echo $UPDATE_URL | sed -e "s/<pass>/$PASSWORD/g" | sed -e "s/<username>/$host/g"  | sed -e "s/<domain>/$domain/g" | sed -e "s/<ipaddr>/$current_ip/g")

        # Update DNS record
        curl --silent --output /dev/null  $update_uri

        echodate "Updated DNS record for $host.$domain to $current_ip"
    else
        echodate "IP has not changed for $host.$domain"
    fi
}


# Loop through the list of domains
for domain_config in "${DOMAINS[@]}"; do
    # Split the domain configuration into host and domain
    read -r host domain <<< "$domain_config"

    # Update DNS record for the domain
    update_dns "$host" "$domain" "$CURRENT_IP"
done