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DDNS update is performed from the script duck.sh:

chmod 700 duck.sh

Open the crontab editor

crontab -e

A cron process runs the script at 5 minute intervals

*/5 * * * * ~/duckdns/duck.sh >/dev/null 2>&1

restart the cron service:

sudo service cron start

Can I expect that @startup: the Raspbian device will execute the duck.sh cron job at boot? Or are other steps necessary to ensure that the cron job is activated on @reboot?

How can ps or pgrep (or any other command) verify that the cron job is active?

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You can verify that with ps -aux | grep duck.sh if process is running or you can see just cron jobs in syslog file by running

grep CRON /var/log/syslog

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