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The hardware is also incorporated into the file hierarchy. Device drivers interface to user applications via an entry in the <tt>/dev </tt> directory. Process information as well is mapped to the file system through the <tt>/proc</tt> directory.
[[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.
== Kernel -or- System Software ==
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