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Chapter 10 : Case Study - UNIX - page 46 / 48

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Ceng 334 - Operating Systems

10-46

Security in UNIX (1)

Each UNIX user has a UID (User ID). A UID is an integer between 0 and 65536. Files, processes and other resources are marked with the UID of their owner

The user with UID 0 is the superuser

Users can be organized in groups, which are also numbered with 16-bit GID’s (Group ID)

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