Implement occ system:cron like in owncloud

[ggeorgg]

I was just making some tests with the previewgenerator app and I wanted to understand better how the whole system works. I was stumbling over the table oc_jobs and I wanted to start/debug the cron job that will (as far as I know) execute exactly these jobs in this table.
In the end I found an occ command to execute the cron jobs with an option "-p" to get a progress information. But this command is not implemented in nextcloud so I had a look into the code of owncloud et voila:
https://github.com/owncloud/core/blob/master/core/Command/System/Cron.php

Does it make sense to also implement this in nextcloud? I have seen, that this file is quite new in owncloud as well (implemented on Jul 4, 2019).

Best regards
Georg

[szaimen]

I think this will be implemented with #27217