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  2. 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 ...

  3. 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).

  4. umask - Wikipedia

    en.wikipedia.org/wiki/Umask

    allows read permission to be enabled for all user classes; the rest of the mask bits are unchanged umask a-x: prohibits enabling execute permission for all user classes; the rest of the mask bits are unchanged umask a+rw: allows read or write permission to be enabled for all user classes; the rest of the mask bits are unchanged umask +rwx

  5. 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 ...

  6. 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 ...

  7. Unix security - Wikipedia

    en.wikipedia.org/wiki/Unix_security

    All files in a typical Unix filesystem have permissions set enabling different access to a file. Unix permissions permit different users access to a file with different privilege (e.g., reading, writing, execution). Like users, different user groups have different permissions on a file.

  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. Comparison of operating system kernels - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_operating...

    Unix permissions? ? ? ? Solaris kernel: C: Solaris, OpenSolaris, GNU/kOpenSolaris Sun Microsystems: ELF (32-bit only until Solaris 7 in 1998) monolithic: IPFilter, PF (since Oracle Solaris 11.3) Yes Yes Yes Zones, chroot: Unix permissions, ACL, RBAC, Auditing, Privileges, Zones, Trusted Extensions