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  2. chmod - Wikipedia

    en.wikipedia.org/wiki/Chmod

    In Unix and Unix-like operating systems, chmod is the command and system call used to change the access permissions and the special mode flags (the setuid, setgid, and sticky flags) of file system objects (files and directories).

  3. File-system permissions - Wikipedia

    en.wikipedia.org/wiki/File-system_permissions

    The read permission grants the ability to read a file. When set for a directory, this permission grants the ability to read the names of files in the directory, but not to find out any further information about them such as contents, file type, size, ownership, permissions. The write permission grants the ability to modify a file. When set for ...

  4. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.

  5. umask - Wikipedia

    en.wikipedia.org/wiki/Umask

    umask command Permissions the mask will prohibit from being set during file creation 0: any permission may be set (read, write, execute) 1: setting of execute permission is prohibited (read and write) 2: setting of write permission is prohibited (read and execute) 3: setting of write and execute permission is prohibited (read only) 4

  6. Sticky bit - Wikipedia

    en.wikipedia.org/wiki/Sticky_bit

    To clear it, use chmod -t /usr/local/tmp or chmod 0777 /usr/local/tmp (the latter will also reset the tmp directory to standard permissions). In Unix symbolic file system permission notation, the sticky bit is represented either by the letter t or T in the final character-place depending on whether the execution bit for the others category is ...

  7. Unix security - Wikipedia

    en.wikipedia.org/wiki/Unix_security

    Sudo command on Ubuntu to temporarily assume root privileges. Most Unix and Unix-like systems have an account or group which enables a user to exact complete control over the system, often known as a root account. If access to this account is gained by an unwanted user, this results in a complete breach of the system.

  8. setuid - Wikipedia

    en.wikipedia.org/wiki/Setuid

    The Unix and Linux access rights flags setuid and setgid (short for set user identity and set group identity) [1] allow users to run an executable with the file system permissions of the executable's owner or group respectively and to change behaviour in directories. They are often used to allow users on a computer system to run programs with ...

  9. Access-control list - Wikipedia

    en.wikipedia.org/wiki/Access-control_list

    These entries are known as access-control entries (ACEs) in the Microsoft Windows NT, [4] OpenVMS, and Unix-like operating systems such as Linux, macOS, and Solaris. Each accessible object contains an identifier to its ACL. The privileges or permissions determine specific access rights, such as whether a user can read from, write to, or execute ...