From LQWiki

The id command prints the UID and GIDs for a given user, or the process invoking the command, if no user is given. On SELinux id displays also the security context.

Examples

$ id
uid=500(robot) gid=500(hive) groups=500(hive)

Prints the process's UID, GID, and supplementary GIDs.

$ id robot
uid=500(robot) gid=500(hive) groups=500(hive),501(dockingbay),502(command)

Print the user's UID, GID, and supplementary GIDs.

# id -Z
context=root:system_r:unconfined_t:SystemLow-SystemHigh

Prints the security context for current user.

See Also

• groups - list only groups, same as id -Gn