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15.
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In Linux and Unix everything is a file. Directories are files, files are files, and devices are files. Devices are usually referred to as nodes; however, they are still files.
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16.
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Linux and Unix file systems are organized in a hierarchical, tree-like structure. The highest level of the file system is the <filename>/</filename> or root directory. All other files and directories exist under the root directory. For example, <filename>/home/konqi/kubuntu.odt</filename> shows the correct full path, or absolute path, to the <filename>kubuntu.odt</filename> file that exists in the <filename>konqi</filename> directory, which is under the <filename>home</filename> directory, which in turn is under the root (<filename>/</filename>) directory.
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