Quote:
Originally Posted by DutchDaemon
Sometimes you want to run a command as a system user (like 'www' or 'nobody'), which typically does not have (or need) a login shell for security reasons.
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Taking this one step further, many consider running applications through a system account to be more secure
(by further limiting resource access...) than simply running an application as root
(which can access everything...). Access separation is considered a good thing, & logging into such accounts is not necessary.