Automatic update of the Debian Linux test environment

A convenient way to maintain the test environment is automatic updating.
However, remember to set the backup, e.g. the day before – I always set it like that in proxmoxe.
The script that updates the Debian system looks like this:

You can download the script from:

The script cleans unnecessary deb files after the update.
Keep in mind the permissions and capabilities of the script:

In crontab, I set the day after automatic backup in proxmoxe:

Of course, the script can be added in the production environment, but it should not be added to the crontab.