Permanent folder sync commandline Client

I tried to setup a folder sync with the commandline Client. I’ve noticed that the sync is run only once but I need it to be permanent. Is there an alternative or cloud it be done by modifying a configuration file?

Setting it up manually on the Client is not an option!

Set it up as a cron job. Something like:

25    0,12  *                 *      *   fred /usr/bin/nextcloudcmd --user fred --password redacted --exclude /dev/null /home/charles/nextcloud https://nextcloud >> /dev/null 2>&1