id(1)

NAME
id - Print user and group information for each specified USER, or (when USER omitted) for the current user.

SYNOPSIS
id [-a|--ignore] [-A ] [-u|--user] [-g|--group] [-G|--groups] [-p ] [-n|--name] [-P ] [-r|--real] [-z|--zero] [-Z|--context] [-h|--help] [-V|--version] [USER]

DESCRIPTION
Print user and group information for each specified USER, or (when USER omitted) for the current user.

OPTIONS

-a, --ignore
    ignore, for compatibility with other versions

-A  Display the process audit user ID and other process audit properties, which requires privilege (not available on Linux).

-u, --user
    Display only the effective user ID as a number.

-g, --group
    Display only the effective group ID as a number

-G, --groups
    Display only the different group IDs as white-space separated numbers, in no particular order.

-p  Make the output human-readable. Each display is on a separate line.

-n, --name
    Display the name of the user or group ID for the -G, -g and -u options instead of the number. If any of the ID numbers cannot be mapped into names, the number will be displayed as usual.

-P  Display the id as a password file entry.

-r, --real
    Display the real ID for the -G, -g and -u options instead of the effective ID.

-z, --zero
    delimit entries with NUL characters, not whitespace; not permitted in default format

-Z, --context
    print only the security context of the process (not enabled)

-h, --help
    Print help

-V, --version
    Print version

[USER]

EXTRA
The id utility displays the user and group names and numeric IDs, of the calling process, to the standard output. If the real and effective IDs are different, both are displayed, otherwise only the real ID is displayed. If a user (login name or user ID) is specified, the user and group IDs of that user are displayed. In this case, the real and effective IDs are assumed to be the same.

VERSION
v(uutils coreutils) 0.6.0