Asus-Merlin-DuckDNS

ddns-start

#!/bin/sh

# register a subdomain at https://www.duckdns.org/ to get your token
# put 'hostname:token' in the 'Host Name' field under DDNS
# e.g. myhost:abcdefgh-1234-5678-9876-f71b0ed7a7fe

DDNS_HOSTNAME_FIELD=$(nvram get ddns_hostname_x)
SUBDOMAIN=$(echo "$DDNS_HOSTNAME_FIELD" | awk -F':' '{print $1}')
TOKEN=$(echo "$DDNS_HOSTNAME_FIELD" | awk -F':' '{print $2}')
IPV4=$(nvram get wan0_ipaddr)
IPV6=$(nvram get ipv6_wan_addr | awk -F'/' '{print $1}')

REQUEST_URL="https://www.duckdns.org/update?domains=${SUBDOMAIN}&token=${TOKEN}&ip=${IPV4}&ipv6=${IPV6}"

logger "DDNS Request URL: ${REQUEST_URL}"

# no modification below needed
RESULT=$(curl --silent "${REQUEST_URL}" 2>&1)
logger "DDNS Request result: $RESULT"

if [[ "$RESULT" == "OK" ]];
then
  /sbin/ddns_custom_updated 1
else
  /sbin/ddns_custom_updated 0
fi

For newer versions I had to change -F'|' to -F':', e.g., myhost:abcdefgh-1234-5678-9876-f71b0ed7a7fe

I had the same problem with the |, changed it to : also. Thanks @Markieta

I have updated the script, thanks.

Cool! You should update the comments at the top as well.