This EX200 practice question tests your understanding of manage users and groups. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
After being added to a new supplementary group with usermod -aG, a user logs out and back in but still cannot access files owned by that group. Which command should the user run to verify current effective group membership?
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.
Why wrong: Option B is incorrect; newgrp is used to change primary group, not to verify membership.
B
id
Option A is correct: the id command displays the current real and effective group IDs, which reflect the session's actual groups.
C
groups $(whoami)
Why wrong: Option D is incorrect; groups with an argument reads the user's groups from /etc/group, which may not reflect the current session's effective groups if the user hasn't fully refreshed (e.g., after su without -).
D
usermod -g
Why wrong: Option C is incorrect; usermod modifies user account settings, not for verification.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
id
The `id` command without arguments displays the real and effective user and group IDs, including all supplementary group memberships. After a user is added to a new group with `usermod -aG`, the change takes effect only in new login sessions; running `id` confirms whether the current shell has actually inherited the new group. Option B is correct because it directly shows the effective group membership for the current process.
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.
✗
newgrp -c 'groups'
Why it's wrong here
Option B is incorrect; newgrp is used to change primary group, not to verify membership.
✓
id
Why this is correct
Option A is correct: the id command displays the current real and effective group IDs, which reflect the session's actual 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.
✗
groups $(whoami)
Why it's wrong here
Option D is incorrect; groups with an argument reads the user's groups from /etc/group, which may not reflect the current session's effective groups if the user hasn't fully refreshed (e.g., after su without -).
✗
usermod -g
Why it's wrong here
Option C is incorrect; usermod modifies user account settings, not for verification.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `groups` or `groups $(whoami)` always shows the effective groups of the current shell, but those commands can display cached or database-level information rather than the kernel-level group list that `id` reliably reports.
Detailed technical explanation
How to think about this question
When a user logs in, the `login` process reads `/etc/group` and sets the supplementary group list for the session via the `initgroups()` system call. The `id` command calls `getgroups()` to retrieve the current process's supplementary group list from the kernel, which is why it accurately reflects the groups available to the shell. A common real-world scenario is when a user is added to a group like `docker` or `wheel`; running `id` immediately after logging out and back in confirms the group is active, whereas `groups` may sometimes show stale data if the shell's group cache is not updated.
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: id — The `id` command without arguments displays the real and effective user and group IDs, including all supplementary group memberships. After a user is added to a new group with `usermod -aG`, the change takes effect only in new login sessions; running `id` confirms whether the current shell has actually inherited the new group. Option B is correct because it directly shows the effective group membership for the current process.
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.
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