- [grant permissions for cron and possible the terminal apps / command line tools to run](https://apple.stackexchange.com/a/378558/5472) on Catalina.
 - check for full paths everywhere...
 - consider putting your commands in a script so you can debug them and avoid needing to escape characters like % or run `cron` in debug/test mode

<sup> I apologize for faffing about. Some robot deems an answer as short as my first one can not conceivably be an answer. So I’ll post some drivel, including this short rant, and then (possibly) edit it out later. </sup>