- A
groupmems -a jane -g wheel,docker
Why wrong: groupmems modifies group memberships but can only handle one group at a time, and -g expects a single group.
- B
usermod -aG wheel,docker jane
The -aG option appends the specified groups to the user's existing supplementary groups.
- C
usermod -a -G wheel,docker jane
Why wrong: Option C is also correct because `usermod -a -G` with the `-a` flag separated from `-G` is equivalent to `-aG` and appends the user to the specified groups without removing existing supplementary group memberships.
- D
usermod -G wheel,docker jane
Why wrong: This sets the supplementary groups to only wheel and docker, removing any existing ones.
Question 531 of 537
EX200 usermod Practice Question
This EX200 practice question tests your understanding of manage users and groups. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: usermod. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An administrator wants to add the user 'jane' to the supplementary groups 'wheel' and 'docker' without removing her from other groups. Which command should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
usermod -aG wheel,docker jane
Option B is correct because `usermod -aG` appends the user to the specified supplementary groups without removing from existing groups. Option C is incorrect because the `-a` flag must be combined with `-G` as a single argument (`-aG`); using `-a -G` separately does not achieve the append effect. Option D is incorrect because `-G` without `-a` overwrites all supplementary groups, removing the user from any groups not listed.
Key principle: usermod
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
groupmems -a jane -g wheel,docker
Why it's wrong here
groupmems modifies group memberships but can only handle one group at a time, and -g expects a single group.
- ✓
usermod -aG wheel,docker jane
Why this is correct
The -aG option appends the specified groups to the user's existing supplementary groups.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
usermod
- ✗
usermod -a -G wheel,docker jane
Why it's wrong here
Option C is also correct because `usermod -a -G` with the `-a` flag separated from `-G` is equivalent to `-aG` and appends the user to the specified groups without removing existing supplementary group memberships.
- ✗
usermod -G wheel,docker jane
Why it's wrong here
This sets the supplementary groups to only wheel and docker, removing any existing ones.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think option C is equivalent to B, but in the RHEL exam, `-a -G` is not accepted; the append flag must be attached directly to `-G`. Also, forgetting `-a` with `-G` (option D) is a common mistake that overwrites existing group memberships.
Detailed technical explanation
How to think about this question
The `usermod` command modifies the `/etc/group` file and the user's entry in `/etc/passwd` (or `/etc/shadow` for passwords). When `-G` is used without `-a`, it sets the supplementary group list to exactly the specified groups, effectively clearing any previous supplementary memberships. The `-a` flag instructs `usermod` to append to the existing list, which is critical in environments where users have multiple group memberships for access control, such as in containerized deployments where 'docker' group membership grants elevated privileges.
KKey Concepts to Remember
- usermod
- append flag (-a)
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
usermod
Real-world example
How this comes up in practice
A practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. usermod Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review usermod, then practise related EX200 questions on the same topic to reinforce the concept.
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Manage users and groups — study guide chapter
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Manage users and groups practice questions
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FAQ
Questions learners often ask
What does this EX200 question test?
Manage users and groups — This question tests Manage users and groups — usermod.
What is the correct answer to this question?
The correct answer is: usermod -aG wheel,docker jane — Option B is correct because `usermod -aG` appends the user to the specified supplementary groups without removing from existing groups. Option C is incorrect because the `-a` flag must be combined with `-G` as a single argument (`-aG`); using `-a -G` separately does not achieve the append effect. Option D is incorrect because `-G` without `-a` overwrites all supplementary groups, removing the user from any groups not listed.
What should I do if I get this EX200 question wrong?
Review usermod, then practise related EX200 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
usermod
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Last reviewed: Jun 11, 2026
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