namecheap dynamic dns update

namecheap.sh

#!/bin/bash

### CONFIG INI
HOST='subdom'
DOMAIN='example.com'
PASSWD='<SECRET>'
URL='https://dynamicdns.park-your-domain.com/update'
### CONFIG END

IP=$(curl -s ifconfig.me)
EC=$?

if [ "${EC}" -eq 0 ]; then
  LAST="$(cat /tmp/${HOST}.${DOMAIN} 2>/dev/null)"
  if [ "${LAST}" != "${IP}" ]; then
    curl -s "${URL}?host=${HOST}&domain=${DOMAIN}&ip=${IP}&password=${PASSWD}" | logger -t "DNS Update"
    EC=${PIPESTATUS[0]}
    if [ "${EC}" -eq 0 ]; then
      echo ${IP} > /tmp/${HOST}.${DOMAIN}
    fi
  else
    echo "No change ( ${IP} == ${LAST} )" | logger -t "DNS Update"
  fi
fi