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SUSE LINUX Enterprise Server 9 Administrator's Handbook by Jacques Beland, Peter Kuo

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Chapter 5 User Environment Management and Security

All process-based activity on a server is governed by the rights and privileges assigned to the user account under which it is running. The preceding chapter discussed how SLES reserves specific ranges of user IDs (UIDs) and group IDs (GIDs) for system accounts, special accounts, and standard user accounts.

In many operating systems, elevated system access is granted through the assignment of rights by the system administrator. If a specific privilege is not granted deliberately, the user account does not experience an elevation in access rights. In Linux, however, an account can obtain intrinsic rights simply by being placed in a specific UID/GID range. Arguably, mistakes can be made in any ...

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