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What facility does system crontab provide that user crontab for root cannot?

System crontab is a great way for distro maintainers and app packagers to include cron jobs that don't pollute the user crontab space.

The system crontab files can specify a user to run as, so not everything in the system crontab has to run as root.

Non-login-users don't have crontabs, so the only place to put non-login-user tasks is in the system crontab.

Generally, you would put local/custom stuff in the root (or appropriate user) crontab, while prepackaged stuff that you don't directly maintain lives in the system crontab.

Really, it's just a matter of organization

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