Instead of using cronjobs and/or any other loop script, let us use Systemd timers to update our domains at DuckDNS. The default Systemd timers are set on every 15 minutes, you can change this yourself
info coming soon, probably will be packaged under the name duckdns
Execute these comments
Clone/download this repo on your computer
mv duckdns.sh /usr/bin/duckdns
chmod +x /usr/bin/duckdns
mv duckdns.service /usr/lib/systemd/system/
mv duckdns.timer /usr/lib/systemd/system/
mkdir -p /etc/duckdns.d
mv default.cfg /etc/duckdns.d/
systemctl enable duckdns.timer
systemctl start duckdns.timer
the default.cfg file shows perfectly what options you must enter, you can create new files if you have multiple domains with the same setup.
duckdns_hostname=
duckdns_token=
Nothing more is needed.
Config files must be placed inside the /etc/duckdns.d folder