Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Linux is a Unix-like computer operating system kernel. It has been ported to a vast variety of computer architectures. Like all Unix systems, its file system is based on one root directory, or hierarchical top point with subdirectories underneath it. Some sub-directories act as mount points, where different physical or networked file systems may be incorporated. The hardware is also incorporated into the file hierarchy. Device drivers interface to user applications via an entry in the /dev directory. Process information as well is mapped to the file system through the /proc 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...

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