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User identifier. Unix-like operating systems identify a user by a value called a user identifier, often abbreviated to user ID or UID. The UID, along with the group identifier (GID) and other access control criteria, is used to determine which system resources a user can access. The password file maps textual user names to UIDs.
sudo. sudo (/ suːduː / [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 page ...
whoami. In computing, whoami is a command found on most Unix-like operating systems, Intel iRMX 86, every Microsoft Windows [1] operating system since Windows Server 2003, and on ReactOS. It is a concatenation of the words "Who am I?"
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. When the command is used without specifying the ...
v. t. e. The Secure Shell Protocol (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. [1] Its most notable applications are remote login and command-line execution. SSH was designed for Unix-like operating systems as a replacement for Telnet and unsecured remote Unix shell protocols ...
A who command that displays the names of users logged in was first implemented within Multics. [1] Later, it appeared in Version 1 Unix [2] and became part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX.1 and the Single Unix Specification. [3]
There is no required format, and the protocol consists mostly of specifying a single command line. The program would supply information such as whether a user is currently logged-on, e-mail address, full name etc. As well as standard user information, finger displays the contents of the .project and .plan files in the user's home directory.
SMTP Authentication. SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory. [1]