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The Single UNIX Specification (SUS) specifies that who should list information about accessible users. The XSI extension also specifies that the data of the username, terminal, login time, process ID, and time since last activity occurred on the terminal, furthermore, an alternate system database used for user information can be specified as an optional argument to who.
getent is a Unix command that helps a user get entries in a number of important text files called databases. This includes the passwd and group databases which store user information – hence getent is a common way to look up user details on 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.
UIDs are stored in the inodes of the Unix file system, running processes, tar archives, and the now-obsolete Network Information Service. In POSIX-compliant environments, the shell command id gives the current user's UID, as well as more information such as the user name, primary user group and group identifier (GID).
A NIS/YP system maintains and distributes a central directory of user and group information, hostnames, e-mail aliases and other text-based tables of information in a computer network. For example, in a common UNIX environment, the list of users for identification is placed in /etc/passwd and secret authentication hashes in /etc/shadow.
User's full name (or application name, if the account is for a program) Building and room number or contact person; Office telephone number; Home telephone number; Any other contact information (pager number, fax, external e-mail address, etc.) In most UNIX systems non-root users can change their own information using the chfn or chsh command.
The command is also available as part of the Windows 2000 Resource Kit [6] and Windows XP SP2 Support Tools. [7] The ReactOS version was developed by Ismael Ferreras Morezuelas and is licensed under the GPLv2. [8] This command was also available as a NetWare-Command residing in the public-directory of the fileserver. It also outputs the current ...
The command displays the process identifiers (PIDs) of processes using the specified files or file systems. In the default display mode, each PID is followed by a letter denoting the type of access: In the default display mode, each PID is followed by a letter denoting the type of access: