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  2. su (Unix) - Wikipedia

    en.wikipedia.org/wiki/Su_(Unix)

    The Unix command su, which stands for 'substitute user' [1] [2] (or historically 'superuser' [3] [4]), is used by a computer user to execute commands with the privileges of another user account. When executed it invokes a shell without changing the current working directory or the user environment.

  3. sudo - Wikipedia

    en.wikipedia.org/wiki/Sudo

    sudo (/ s uː d uː / [4]) is a program for Unix-like computer operating systems that enables users to run programs with the security privileges of another user, by default the superuser. [5] It originally stood for "superuser do", [ 6 ] as that was all it did, and this remains its most common usage; [ 7 ] however, the official Sudo project ...

  4. Superuser - Wikipedia

    en.wikipedia.org/wiki/Superuser

    In some cases, the actual name of the account is not the determining factor; on Unix-like systems, for example, the user with a user identifier (UID) of zero is the superuser [i.e., uid=0], regardless of the name of that account; [1] and in systems which implement a role-based security model, any user with the role of superuser (or its synonyms ...

  5. Delegation (computer security) - Wikipedia

    en.wikipedia.org/wiki/Delegation_(computer_security)

    The most common way of ensuring computer security is access control mechanisms provided by operating systems such as UNIX, Linux, Windows, Mac OS, etc. [5] If the delegation is for very specific rights, also known as fine-grained, such as with Role-based access control (RBAC) delegation, then there is always a risk of under-delegation, i.e., the delegator does not delegate all the necessary ...

  6. nobody (username) - Wikipedia

    en.wikipedia.org/wiki/Nobody_(username)

    The reason is that processes owned by the same user have the ability to send signals to each other and use debugging facilities to read or even modify each other's memory. Modern practice, as recommended by the Linux Standard Base , is to create a separate user account for each daemon.

  7. Unix-like - Wikipedia

    en.wikipedia.org/wiki/Unix-like

    Most such systems are commercial derivatives of the System V code base in one form or another, although Apple macOS 10.5 and later is a BSD variant that has been certified, and EulerOS [14] [15] and Inspur K-UX [16] are Linux distributions that have been certified. A few other systems (such as IBM z/OS) earned the trademark through a POSIX ...

  8. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Return user identity System V ipcrm: Misc Optional (XSI) Remove a message queue, semaphore set, or shared memory segment identifier System V ipcs: Misc Optional (XSI) Report interprocess communication facilities status System V jobs: Process management Optional (UP) Display status of jobs in the current session join: Text processing Mandatory

  9. 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 ...