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→File Permissions
Since the Unix / Linux operating systems allow for '''multiple usersuser accounts''' 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|400px|Detailed directory listing showing permissions for a '''directory''' and a '''regular file'''.]]
Setting the umask value (for example umask 022) only takes effect for the current shell session unless the umask command is contained in a start-up file<br>(e.g. '''.profile''', '''.bash_profile''', or '''.bashrc''').
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=INVESTIGATION 1: NUMBERING CONVERSIONS=
