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→File Permissions
Since the Unix / Linux operating systems allow for '''multiple user accounts''' it is essential<br>to have a system to '''share''' or '''limit''' access to directories and files contained in those different user accounts.
[[Image:listing-file-directory.png|thumb|right|400px|Detailed directory listing showing permissions for a '''directory''' <br>and a '''regular file'''.]]
When '''directories''' and r'''egular files''' are created, they are assigned to an '''owner'''<br>(typically the username which is the creator).
