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{{Expert|date=February 2009}}
'''Linux''' is a [[Unix-like]] based computer operating system. It has been ported to a vast variety of computer architectures.
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It is interesting to note that Unix security systems were designed into the architecture. Raw hardware devices are protected from direct access, and the file system has an inbuilt security system giving individual access to files on three levels, user only, group membership, and world access. Each category has read, executable and write flags that may be set in any combination.
http://www.cyberciti.biz/faq/understanding-architecture-of-linux/
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