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{{Portal box|Linux
Unixes have a multi-tier security that permits user ''[[root (Linux)|root]]'' any system-wide changes. Regular users can be limited: where they can save files, what hardware they can access, their memory usage, applications, disk usage ([[disk quota|quota]]), and the range of [[Scheduling (computing)|priority]] settings they can apply, can all be specified to provide sufficient freedoms. If necessary they must become ''root''. (See <tt>[[su (Unix)|su]]</tt> or [[sudo]]). There are also group accounts management, and file and directory permissions.
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