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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. Unix security - Wikipedia

    en.wikipedia.org/wiki/Unix_security

    A core security feature in these systems is the file system permissions. 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).

  4. 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 ...

  5. Unix file types - Wikipedia

    en.wikipedia.org/wiki/Unix_file_types

    A file's type can be identified by the ls -l command, which displays the type in the first character of the file-system permissions field. For regular files, Unix does not impose or provide any internal file structure; therefore, their structure and interpretation is entirely dependent on the software using them. [2] However, the file command ...

  6. chmod - Wikipedia

    en.wikipedia.org/wiki/Chmod

    File-system permissions; chattr, the command used to change the attributes of a file or directory on Linux systems; chown, the command used to change the owner of a file or directory on Unix-like systems; chgrp, the command used to change the group of a file or directory on Unix-like systems

  7. Group identifier - Wikipedia

    en.wikipedia.org/wiki/Group_identifier

    In Unix-like systems, multiple users can be put into groups. POSIX and conventional Unix file system permissions are organized into three classes, user, group, and others.The use of groups allows additional abilities to be delegated in an organized fashion, such as access to disks, printers, and other peripherals.

  8. umask - Wikipedia

    en.wikipedia.org/wiki/Umask

    Name Description r: read: read a file or list a directory's contents w: write: write to a file or directory x: execute: execute a file or recurse a directory tree X: special execute: See Symbolic modes. s: setuid/gid: See File permissions. t: sticky: See File permissions.

  9. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Find files Version 1 AT&T UNIX fold: Text processing Mandatory Filter for folding lines 1BSD fuser: Process management Optional (XSI) List process IDs of all processes that have one or more files open System V gencat: Misc Mandatory Generate a formatted message catalog get: SCCS Optional (XSI) Get a version of an SCCS file PWB UNIX getconf ...