Bash script to update NameCheap DDNS

update-ddns-namecheap.sh

#!/bin/sh


dnsserver="freedns2.registrar-servers.com"
host="host"
domain_name="your.domain"
ddns_password="YOUR-DDNS-PASSWORD-HERE"
dnsrecord=$host.$domain_name


# Get the current external IP address
current_ip=`curl -s -X GET https://checkip.amazonaws.com`
datestr=`date`

## NameChaep FreeDNS Dynamic Update URL
## keep these private
UPDATE_URL="https://dynamicdns.park-your-domain.com/update?host=$host&domain=$domain_name&password=$ddns_password&ip=$current_ip"

echo "[$datestr] Current IP is $current_ip"
dnsresult="[$datestr] `host $dnsrecord $dnsserver | grep 'has address'`"
if echo $dnsresult | grep "$current_ip"; then
  echo "[$datestr] $dnsrecord is currently set to $current_ip; no changes needed"
  exit 0
fi

# if here, the dns record needs updating
result=`curl -s -X GET $UPDATE_URL`
echo "[$datestr] Update Result: \n$result"
exit 0