Freemyip or DYNU Dynamic IP Updater Linux Bash Script, check external every 60 seconds (please change it to a LARGER value if you need to change to avoid blacklist). It runs as a auto-start job on my CoreELEC Amlogic S905 box

Freemyip DYNU Dynamic IP Updater.sh

#!/bin/sh
# It calls an external python script sendmail.py to email the new IP out
# This should work on both bash and sh shells e.g. LibreELEC/CoreELEC

# DYNU Dynamic IP Updater
# https://wiki.libreelec.tv/useful_shell_scripts#dynu_dynamic_ip_updater
# Modified to update Freemyip DYNDNS

# Modify These for DYNU or other DynDNS services e.g. Freemyip, DuckDNS, etc.
DYNU_USERNAME="username"
DYNU_PASSWORD="password-hash"
DYNU_HOSTNAME="example.dynu.com"
REFRESH_RATE=600

# Leave set to 0.0.0.0, will be initialized with a Publich IP during first run
PUBLIC_IP=0.0.0.0

test_ip ()
{
        # Comparing IP Address $1=Existing IP $2=IP Fetched Externally
        dt=$(date +"%r,%Y%m%d")
        if [ -n $2 ] ; then
                if [ $1 != $2 ] ; then
                        echo "New IP detected, Updating DynDNS & Existing IP $1 to New IP $2"
                        update_ip $2 $1
                        PUBLIC_IP=$2
                else
                        echo "$1 - $2 IPs are the same, no action required"
                fi
        fi
}

update_ip ()
{
        LOCAL_IP=$(ip addr show wlan0 | awk '/inet/ {print $2}' | sed 's#/.*##')
        # DYNU_WGET="https://api.dynu.com/nic/update?hostname=$DYNU_HOSTNAME&myip=$1&username=$DYNU_USERNAME&password=$DYNU_PASSWORD"
        FREEMYIP_WGET="https://freemyip.com/update?token=YOUR_TOKEN&domain=YOUR_SUBDOMAIN.freemyip.com&verbose=yes"
        DYNU_UPDATE=`wget $FREEMYIP_WGET -O - -q ; echo`
        dt=$(date +"%m-%d-%Y, %r")
        echo "$DYNU_UPDATE NewIP=$1 OldIP=$2 LocalIP=$LOCAL_IP DateTime=$dt"
        # send an email notification with new and old IPs
        /storage/freemyip/sendmail.py $1 $2
        (>&2 echo "$DYNU_UPDATE")
}

get_pubip ()
{
   # Loop and Fetch a public IP from one of these servers
   # break the loop only if IP returned from the servers is a true IP
   URLS="ipecho.net/plain
        checkip.dyndns.org
        ifconfig.co
        myexternalip.com/raw
        canhazip.com
        ifconfig.me
        api6.ipify.org
        plain-text-ip.com
        ident.me
        api.ipify.org"

   while true; do
        url=`echo ${URLS} | cut -d' ' -f$((1 + RANDOM % 10))`
        PUBLIC_IP_TEST=`curl -s $url | sed 's#.*Address: \(.*\)</b.*#\1#'`
        echo $PUBLIC_IP - $PUBLIC_IP_TEST, $url
        if echo "$PUBLIC_IP_TEST" | grep "[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$"; then
                # Initialise $PUBLIC_IP when it first runs
                if [ "$PUBLIC_IP" = "0.0.0.0" ]; then
                        PUBLIC_IP=$PUBLIC_IP_TEST
                fi
                break
        else
                dt=$(date +"%r,%Y%m%d")
                echo "IP '$PUBLIC_IP_TEST' fetched from '$url' at $dt doesn't look like an IP address. Current IP '$PUBLIC_IP'"
        fi
        sleep 15
   done
}

while true; do
        get_pubip
        test_ip $PUBLIC_IP $PUBLIC_IP_TEST
        sleep $REFRESH_RATE
done

Hello and thank you for the script. How can I hash the password? Is it MD5?

EDIT found it: https://www.dynu.com/NetworkTools/Hash