Checking a user's identity and groups | LinuC Level 1 102 Exam original practice question

1.08.1Basic

Inspect app01's UID, primary GID, and supplementary groups in one command.

Which command is appropriate?

Hint 1: Focus on account attributes

Separate account creation, home-directory handling, group membership, login identity, and password state before comparing the commands.

Hint 2: Key terms

Review the short definitions of account records, groups, home directories, shells, and password state involved.

id: A command that displays a user's UID, GID, and group memberships.
UID: The numeric identifier assigned to a user account.
Primary GID: The numeric group identifier used as the user's primary group.
Supplementary groups: Additional group memberships resolved for the user.

Detailed explanation

Incorrectgetent passwd app01

Incorrect. passwd data does not list all supplementary memberships.

Incorrectgetent group app01

Incorrect. It finds a group with that name, not all groups for the user.

Incorrectwho app01

Incorrect. who lists current login sessions.

Correctid app01

Correct. id app01 displays the requested identity information.

An example you can run in a temporary verification environment.

id $(id -un)

uid=、gid=、groups=を含む現在ユーザーの情報

Foundation review

Identity attributes such as a user ID, home directory, and login shell.

Primary and supplementary groups used during permission checks.

State and time limits that control password changes and account access.

Question IDKL-102-1036

EnvironmentGNU coreutils id / 現在ユーザーの読み取りのみ

Last technical review2026-08-13

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