If both the cron.allow and the cron.deny files do not exist, the default on current Ubuntu and other Debian-based systems is to allow all users to use the crontab command.
If only the cron.allow file exists, then only the users listed in the file can execute the crontab command.
If only the cron.deny file exists, then all users listed in this file are denied the ability to execute the crontab command, and all other users are allowed to use the crontab command.
If both the cron.allow and the cron.deny files exist, the cron.allow file applies and the cron.deny file is ignored. As only one of these files should exist, the presence of both files is typically due to a mistake made by the administrator.
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