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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.
[[Image:listing-file-directory.png|thumb|right|100px|]]
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.
<table><tr><td>[[Image:listingdirectory-filepermissions.png|thumb|right|100px|]]</td><td>[[Image:directory-directorypermissions.png|thumb|right|100px|]]</td></tr></table>
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