I probably won't make it with this... I don't want to look for it on the internet... I don't know your firmware... sorry.
This is another question from you - configuring the CRON service. This, in turn, is a long story.
First of all, CRON can be used in various Linux systems in various ways, even with a slightly different version. Somewhere it's "crond", somewhere "crontab" and somewhere it's just "cron". Of course, after each editing of the CRON configuration file, you must restart the CRON service. I don't know what CRON your Linux system is using, so I don't know where and how to edit the files and I also don't know how to restart CRON in your case. It's different everywhere.
The surest way is to configure via the CRON service tool and then restart the entire set-top box:
crontab -e
After saving the changes, just restart the system:
reboot
Depending on your Enigma2 distribution, a Nano or Vi text editor may be used. The default text editor can be changed (if installed), but I don't know exactly where.
Unfortunately, Vi is an ancient and only easy-to-use editor via the console / terminal (keyboard keys). Unfortunately, this Vi editor does not have very comprehensive support for using cursor keys, backspace, text highlighting, etc. as in modern text editors. It is possible, but complicated. I think Nano is a more human editor.
Or try to google yourself how to properly restart and configure your CRON, on your Linux system (in your Enigma2 distribution). In some Enigma2 distributions, it is possible to install and configure CRON even directly through the GUI (via SKIN) with the help of RCU.