This LFCS practice question tests your understanding of essential commands. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
-rwxr-x--- 1 root developers 1234 Feb 20 10:00 script.sh
Refer to the exhibit. The file script.sh has permissions -rwxr-x--- and is owned by root with group 'developers'. A user named 'alice' is a member of the 'developers' group. Which command allows alice to execute the script without changing the file's group ownership?
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 developers alice
Option A is correct because the script's permissions (-rwxr-x---) grant execute permission to the owner (root) and the group (developers), but not to others. Alice is already a member of the developers group, so the command 'usermod -aG developers alice' would not change her group membership (it would simply re-add her). However, the question asks which command allows Alice to execute the script without changing the file's group ownership. Since Alice is already in the developers group, she already has execute permission via the group. The command in A is redundant but does not change group ownership, and it is the only option that does not alter the file's group or permissions in a way that violates the constraint. The core reasoning is that Alice already has group execute permission, so no command is actually needed, but among the options, A is the only one that does not change the file's group ownership.
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 developers alice
Why this is correct
Adding alice to the developers group gives her the group execute permission.
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.
✗
chmod o+x script.sh
Why it's wrong here
This adds execute for others, but alice already has group execute, so this is unnecessary and changes permissions for all others.
✗
chmod u+x script.sh
Why it's wrong here
This adds execute for owner, but alice is not the owner.
✗
chown alice script.sh
Why it's wrong here
Changing owner gives alice owner permissions, but the question asks without changing group ownership (implied no ownership change).
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Alice does not have group execute permission and choose options that change file permissions or ownership, missing that the question's constraint ('without changing the file's group ownership') is a red herring — the real issue is that Alice already has access, so the only 'correct' command among the options is the one that does nothing harmful, but Linux Foundation often tests whether you recognize that group membership already grants access and that modifying the file is unnecessary.
Detailed technical explanation
How to think about this question
Under the hood, Linux file permissions are checked in order: owner, then group, then others. Since Alice is in the developers group, the kernel's permission check will match the group entry and grant execute access based on the group execute bit (--x). The 'usermod -aG' command modifies the /etc/group file and updates the user's supplementary group list in /etc/passwd or /etc/shadow, but if Alice is already a member, it is a no-op. A real-world scenario where this matters is when a user is accidentally removed from a group; re-adding them with 'usermod -aG' restores access without altering file metadata, which is critical in shared development environments where group ownership must remain stable for audit trails.
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 LFCS 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.
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: usermod -aG developers alice — Option A is correct because the script's permissions (-rwxr-x---) grant execute permission to the owner (root) and the group (developers), but not to others. Alice is already a member of the developers group, so the command 'usermod -aG developers alice' would not change her group membership (it would simply re-add her). However, the question asks which command allows Alice to execute the script without changing the file's group ownership. Since Alice is already in the developers group, she already has execute permission via the group. The command in A is redundant but does not change group ownership, and it is the only option that does not alter the file's group or permissions in a way that violates the constraint. The core reasoning is that Alice already has group execute permission, so no command is actually needed, but among the options, A is the only one that does not change the file's group ownership.
What should I do if I get this LFCS 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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Question Discussion
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