Adding multiple supplementary groups | LinuC Level 1 102 Exam original practice question

1.08.1Basic

Create user mei as a member of both audio and video supplementary groups.

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.

Supplementary-group option: The option that supplies a comma-separated supplementary-group list.
Comma-separated list: A single argument containing multiple values separated by commas.
-g: The option that selects one primary group.
-a: The usermod option that appends groups instead of replacing the existing list.

Detailed explanation

Correctuseradd -G audio,video mei

Correct. It supplies both supplementary groups as one comma-separated list.

Incorrectuseradd -g audio,video mei

Incorrect. -g selects a single primary group.

Incorrectuseradd -G audio video mei

Incorrect. The supplementary list is one argument separated with commas.

Incorrectuseradd -a audio,video mei

Incorrect. useradd does not use -a for this option.

An example you can run in a temporary verification environment.

useradd --help | grep -E -- '-G,|--groups'

補助グループ一覧を示す説明行

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-102-1017

Environmentshadow-utils useradd help / 状態変更なし

Last technical review2026-08-13

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