If there is neither a cron.allow nor a cron.deny file,
then the use of cron is unrestricted (i.e. every user can use it).
If you were to put the name of some users into the
cron.allow file, without creating a cron.deny file, it would have the
same effect as creating a cron.deny file with ALL in it.
This means that any subsequent users that require cron
access should be put in to the cron.allow file.
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