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File-system permissions
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<p>Most <a href="/facts/File_system/FdPm90uc">file systems</a> include attributes of files and directories that control the ability of users to read, change, navigate, and <a href="/facts/Execution_(computing)/1fyfGMFm">execute</a> the contents of the file system. In some cases, menu options or functions may be made visible or hidden depending on a user's permission level; this kind of <a href="/facts/User_interface/e9sPEWVD">user interface</a> is referred to as <a href="/facts/Permission-driven_user_interface/e9sPEWVD">permission-driven</a>. </p><p>Two types of permissions are widely available: <a href="/facts/POSIX/mQkSt234">POSIX</a> file system permissions and <a href="/facts/Access-control_list/t38J9Vao">access-control lists</a> (ACLs) which are capable of more specific control. </p>