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.
Which TWO commands can be used to add a user to a secondary group without removing existing supplementary group memberships? (Choose exactly 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
usermod -aG group user
Option A is correct because `usermod -aG` appends the user to the specified supplementary group(s) without affecting any existing supplementary group memberships. The `-a` flag (append) must be used with `-G` to avoid overwriting the current list of supplementary groups. This is the standard method in Red Hat Enterprise Linux for adding a user to an additional group while preserving all other group memberships.
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.
✓
usermod -aG group user
Why this is correct
Option A is correct; -aG appends the user to the supplementary groups list without affecting others.
Related concept
Read the scenario before looking for a memorised answer.
✗
usermod -AG group user
Why it's wrong here
Option E is incorrect; -A is not a valid option for usermod.
✗
adduser user group
Why it's wrong here
Option D is incorrect; adduser is typically used to create users, not to add to groups.
✓
gpasswd -a user group
Why this is correct
Option B is correct; gpasswd -a adds the user to the specified group.
Related concept
Read the scenario before looking for a memorised answer.
✗
groupadd -a user group
Why it's wrong here
Option C is incorrect; groupadd creates new groups, not add users to groups.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `usermod -G` (which replaces all supplementary groups) with `usermod -aG` (which appends), and may also mistakenly think `groupadd` or `adduser` can modify group memberships, when in fact only `usermod -aG` and `gpasswd -a` are the correct tools for this task.
Detailed technical explanation
How to think about this question
Under the hood, supplementary group memberships are stored in the `/etc/group` file as a comma-separated list of usernames in the fourth field. The `usermod -aG` command appends the username to that list for the specified group(s), while `gpasswd -a` directly modifies the group entry by adding the user to the group's member list. Both methods avoid altering other group memberships, which is critical in multi-group environments like shared project directories where users need access to multiple collaboration groups without losing access to others.
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 group user — Option A is correct because `usermod -aG` appends the user to the specified supplementary group(s) without affecting any existing supplementary group memberships. The `-a` flag (append) must be used with `-G` to avoid overwriting the current list of supplementary groups. This is the standard method in Red Hat Enterprise Linux for adding a user to an additional group while preserving all other group memberships.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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