Id command

A CLI command available on most Linux platforms; used to display user, group and process identities (UID, GID.)

Usage Syntax

id [options]

Common options include;

-Z - display only the security context of the current process - selinux enabled kernels only
-g - display only the effective group ID (GID)
-G - display all group IDs (GIDs)
-u - display only the effective user ID (UID)
-n - when used with one of: -u, -g or -G, display a name instead of a number
-r - when used with one of: -u, -g or -G, display the real ID instead of the effective ID

id - display effective user and group IDs and all group IDs, names and numbers

id -un - display only the effective user ID (UID) name

id -gr - display only the real group ID (GID)

The root user always has a UID of 0.

With most Linux or Unix commands;

Non root users may need to prefix commands with the sudo command, for example: sudo chmod 644 *
Brief help can be displayed using the -h or --help parameter, for example: chmod --help
A full command manual can be displayed using the man command followed by the command name, for example: man chmod
Sometimes 'info' pages are used instead of or to provide more information than man pages; for example: info chmod
Version information can normally be display using the -v, -V or --version parameter, for example: chmod --version. However, this paramater is also frequently used to display verbose output.

noinclude/noinclude

noinclude/noinclude

id;

uid=503(testuser) gid=501(bossteam) groups=501(bossteam)

The id executable is normally found here: /usr/bin/id

This command is part of the GNU coreutils package, which can be installed or upgraded as follows, depending on your platform;