The correct command is `usermod -aG wheel,docker jane`. This works because the `-a` flag, short for append, must be paired with `-G` to add the user to supplementary groups without removing existing memberships; without `-a`, the `-G` flag alone overwrites the entire supplementary group list, stripping any groups not specified. On the Red Hat Certified System Administrator EX200 exam, this tests your understanding of user and group management, a core objective in the RHCSA domain, and the most common trap is forgetting the `-a` flag—candidates often use `usermod -G` alone, which accidentally removes jane from groups like `ftp` or `users`. The exam expects you to know that `usermod -g` (lowercase) changes the primary group, while `-G` with `-a` safely appends supplementary groups. A reliable memory tip: think of `-aG` as “add Groups” to remember the append flag is mandatory for preserving existing memberships.
EX200 Manage users and groups 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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 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 the `usermod -aG` command appends the user 'jane' to the supplementary groups 'wheel' and 'docker' without removing her from any existing supplementary groups. The `-a` (append) flag must be used with `-G` to avoid overwriting the current group membership list, which is the default behavior of `-G` alone.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Read the scenario before looking for a memorised answer.
✗
usermod -a -G wheel,docker jane
Why it's wrong here
The -a flag must be used with -G, but the order is wrong; it should be -aG.
✗
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 often forget that `usermod -G` without `-a` overwrites all supplementary groups, leading them to choose option D, which would remove the user from any groups not listed, such as 'users' or other custom groups.
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
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Manage users and groups — This question tests Manage users and groups — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: usermod -aG wheel,docker jane — Option B is correct because the `usermod -aG` command appends the user 'jane' to the supplementary groups 'wheel' and 'docker' without removing her from any existing supplementary groups. The `-a` (append) flag must be used with `-G` to avoid overwriting the current group membership list, which is the default behavior of `-G` alone.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO commands can be used to add the user 'alice' to the supplementary group 'developers'?
medium
✓ A.gpasswd -a alice developers
B.useradd -g developers alice
✓ C.usermod -aG developers alice
D.groupmod -a alice developers
E.usermod -g developers alice
Why A: Option A is correct because `gpasswd -a alice developers` adds the user 'alice' to the supplementary group 'developers' by appending her to the group's member list in /etc/group. Option C is correct because `usermod -aG developers alice` appends 'alice' to the supplementary group 'developers' without removing her from other supplementary groups, which is the intended behavior for adding a user to an additional group.
Last reviewed: Jun 11, 2026
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