Dynamic DNS update script (Namecheap)

#!/bin/bash

################################################################
# Title:.......ddns_update.sh                                  #
# Author:......Prilly                                          #
# Support:.....prilly@speedbox.me                              #
# Date:........13.07.2018                                      #
# Description:.Dynamic DNS updater script Namecheap            #
################################################################

# DNS resolver used for query 
# (opendns=208.67.222.222|resolver1.opendns.com, google=8.8.8.8)
dns="resolver1.opendns.com"
log_file="/var/log/ddclient.log"

check_update(){
for host in ${hostlist[@]}; do
    if [ ${host} == "@" ]; then
        ip_address_current=$(nslookup ${domain} ${dns} | grep Address | grep -v "#" | cut -f2 -d" ")
    else
        ip_address_current=$(nslookup ${host}.${domain} ${dns} | grep Address | grep -v "#" | cut -f2 -d" ")
    fi
    ip_diff_check=$(echo ${ip_address_current} | grep -c ${ip_address_new})
    if [ ${ip_diff_check} -eq 0 ]; then
        echo "$(date "+%d/%m/%y %R - Update old IP address: ${ip_address_current} With new IP address: ${ip_address_new} For domain: ${host}.${domain}")" &>> ${log_file}
        curl https://dynamicdns.park-your-domain.com/update?host=${host}\&domain=${domain}\&password=${password}\&ip=${ip_address_new} &>> ${log_file}
    else
        break
    fi
done
}

ip_address_new=$(dig +short myip.opendns.com @resolver1.opendns.com)

####################################
# Copy and paste this code as many times as you need. 
# Change the values in the hostlist for the A records you wish to update,
# the domain to your domain, and the password as given out by Namecheap
#
### domain.tld ###
# hostlist=("@" "www" "beta")
# domain="domain.tld"
# password="########################"
# check_update
####################################

### example.me ###
hostlist=("@" "www" "beta")
domain="domain.me"
password="-----------key/PASS-----------"
check_update
####################################

exit 0