- A
The file lacks execute permission for the group
644 gives read/write to owner, read to group, no execute. Group needs execute to run.
- B
The file does not have the setgid bit
Why wrong: Setgid affects group inheritance, not execution permission.
- C
The user's primary group is not 'staff'
Why wrong: Supplementary group membership is sufficient for group permissions, not just primary group.
- D
The user is not the owner of the file
Why wrong: Ownership is not required for execution if group permission allows.
Question 128 of 513
LFCS User and Group Management Practice Question
This LFCS practice question tests your understanding of user and group management. 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.
A user reports that they cannot execute a file even though they are in the file's group. The file has permissions 644 and group ownership 'staff'. The user is a member of 'staff'. What is the likely issue?
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
✓
The file lacks execute permission for the group
The file has permissions 644, which means the owner has read/write (6), the group has read-only (4), and others have read-only (4). Since the user is a member of the group 'staff' but not the owner, they fall under the group permission class. The group lacks execute permission (the 'x' bit), so the user cannot execute the file. Execute permission is required to run a file as a command or script, regardless of group membership.
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.
- ✓
The file lacks execute permission for the group
Why this is correct
644 gives read/write to owner, read to group, no execute. Group needs execute to run.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The file does not have the setgid bit
Why it's wrong here
Setgid affects group inheritance, not execution permission.
- ✗
The user's primary group is not 'staff'
Why it's wrong here
Supplementary group membership is sufficient for group permissions, not just primary group.
- ✗
The user is not the owner of the file
Why it's wrong here
Ownership is not required for execution if group permission allows.
Common exam traps
Common exam trap: answer the scenario, not the keyword
LFCS exams often test the distinction between file ownership and group membership, trapping candidates who think being in the group automatically grants execute permission without checking the actual permission bits.
Detailed technical explanation
How to think about this question
Under Linux, file permissions are checked in order: owner, group, then others. The first matching class determines access. Here, the user is not the owner, so group permissions apply. The execute bit (x) on a regular file is required to run it as a binary or script; without it, the kernel will return EACCES. In practice, this often occurs with compiled programs or shell scripts that were installed with read-only group permissions, such as those from a package manager that defaults to 644.
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.
- →
User and Group Management — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this LFCS question test?
User and Group Management — This question tests User and Group Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The file lacks execute permission for the group — The file has permissions 644, which means the owner has read/write (6), the group has read-only (4), and others have read-only (4). Since the user is a member of the group 'staff' but not the owner, they fall under the group permission class. The group lacks execute permission (the 'x' bit), so the user cannot execute the file. Execute permission is required to run a file as a command or script, regardless of group membership.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
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