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File Permissions
Since the Unix / Linux operating systems allow for multiple users to be created on a single server,<br>it is essential for users on these servers to '''share''' or '''limit''' access to directories and files contained in those directories.
When directories and regular files are created, then are assigned ownership to a user account.
Permissions act like a two-layered defence: First, the directory that contains regular files, and second, to the regular files themselves.

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