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The chmod command is also capable of changing the additional permissions or special modes of a file or directory. The symbolic modes use ' s ' to represent the setuid and setgid modes, and ' t ' to represent the sticky mode. The modes are only applied to the appropriate classes, regardless of whether or not other classes are specified.
Most file systems include attributes of files and directories that control the ability of users to read, change, navigate, and execute 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 user interface is referred to as permission-driven.
Variable files: files whose content is expected to continually change during normal operation of the system, such as logs, spool files, and temporary e-mail files. /var/cache: Application cache data. Such data are locally generated as a result of time-consuming I/O or calculation. The application must be able to regenerate or restore the data.
They are notably used by the NFS server of the Interix POSIX subsystem in order to implement Unix-like permissions. The Windows Subsystem for Linux added in the Windows 10 Anniversary Update uses them for similar purposes, storing the Linux file mode, owner, device ID (if applicable), and file times in the extended attributes. [27]
The file system permissions of a symbolic link are not used; the access modes of the target file are controlled by the target file's own permissions. Some operating systems, such as FreeBSD, offer the ability to modify file permissions and filesystem attributes of a symbolic link, through lchmod [12] and lchflags [13] system calls respectively.
In the case of file systems, mapping between files and the security contexts is called labeling. The labeling is defined in policy files but can also be manually adjusted without changing the policies. Hardware types are quite detailed, for instance, bin_t (all files in the folder /bin) or postgresql_port_t (PostgreSQL port, 5432). The SELinux ...
Returns information on the server status, including the status of the current connection STOR RFC 959 Accept the data and to store the data as a file at the server site STOU RFC 959 Store file uniquely. STRU RFC 959 Set file transfer structure. SYST RFC 959 Return system type. THMB Streamlined FTP Command Extensions
AppArmor ("Application Armor") is a Linux kernel security module that allows the system administrator to restrict programs' capabilities with per-program profiles. Profiles can allow capabilities like network access, raw socket access, and the permission to read, write, or execute files on matching paths.