- A
The devteam group does not include all members; add each user to the devteam group.
Why wrong: The group membership is not the issue; the directory permissions are too restrictive.
- B
The parent directory /data/projects lacks execute permission for devteam; add execute permission to /data/projects.
Why wrong: The parent directory already has rwx for group; execute is present (x in rwx).
- C
The sticky bit is not set; set the sticky bit on proj1 to allow only owners to delete files.
Why wrong: Sticky bit does not affect ability to create files; it affects deletion of files. The immediate issue is no write access.
- D
The proj1 directory lacks group write and execute permissions; use chmod g+rwx proj1 and chmod g+s proj1 to allow group members to create files and ensure new files inherit group.
drwx------ means only owner has access; adding group rwx gives devteam access; SGID ensures new files belong to devteam.
Quick Answer
The correct solution is to add group write and execute permissions and then set the setgid bit on the project subdirectory. The problem arises because /data/projects/proj1 has permissions drwx------, which grants no access to the devteam group; without group execute and write permissions, group members cannot traverse into or create files within the directory. By running chmod g+rwx proj1, you allow the group to write and enter, and applying chmod g+s proj1 ensures that any new files created inside inherit the directory’s group ownership, maintaining collaborative access. On the LFCS exam, this scenario tests your understanding of special permissions for shared directories—a common trap is forgetting that execute permission is required to enter a directory, even when write is set. Remember the mnemonic “SetGID for Shared Inheritance”: the sticky bit controls deletion, but setgid controls group inheritance, so when you need group write without deletion by others, pair setgid with proper ownership.
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.
You are managing a multi-user Linux server used by a development team. The server has a shared directory /data/projects where each project has a subdirectory owned by a project lead. The requirement is that all members of the 'devteam' group need to be able to create files in any project subdirectory, but only the project lead (owner) should be able to delete files. Currently, members of devteam are unable to create files in /data/projects. You check permissions: /data/projects has drwxrwxr-x root:devteam. Each project subdirectory, e.g., /data/projects/proj1, has drwx------ lead1:devteam. The lead1 user is in devteam. What is the most likely reason that devteam members cannot create files in proj1, and what is the correct solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 proj1 directory lacks group write and execute permissions; use chmod g+rwx proj1 and chmod g+s proj1 to allow group members to create files and ensure new files inherit group.
Option D is correct because the project subdirectory /data/projects/proj1 has permissions drwx------ (700), which means only the owner (lead1) has read, write, and execute access. The devteam group lacks both write and execute permissions, preventing group members from creating files. The solution is to add group write and execute permissions (chmod g+rwx proj1) and set the setgid bit (chmod g+s proj1) so that new files inherit the group ownership, ensuring all devteam members can create files while only the owner can delete them.
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 devteam group does not include all members; add each user to the devteam group.
Why it's wrong here
The group membership is not the issue; the directory permissions are too restrictive.
- ✗
The parent directory /data/projects lacks execute permission for devteam; add execute permission to /data/projects.
Why it's wrong here
The parent directory already has rwx for group; execute is present (x in rwx).
- ✗
The sticky bit is not set; set the sticky bit on proj1 to allow only owners to delete files.
Why it's wrong here
Sticky bit does not affect ability to create files; it affects deletion of files. The immediate issue is no write access.
- ✓
The proj1 directory lacks group write and execute permissions; use chmod g+rwx proj1 and chmod g+s proj1 to allow group members to create files and ensure new files inherit group.
Why this is correct
drwx------ means only owner has access; adding group rwx gives devteam access; SGID ensures new files belong to devteam.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may focus on the sticky bit (Option C) because it relates to deletion control, but they overlook that the primary issue is the lack of group write and execute permissions on the subdirectory, which prevents file creation entirely.
Detailed technical explanation
How to think about this question
The setgid bit (chmod g+s) on a directory ensures that newly created files and subdirectories inherit the group of the parent directory, which is critical in collaborative environments to maintain consistent group ownership. Without group execute permission on a directory, users cannot traverse into it or access its contents, even if they have write permission; this is why both write and execute are needed for group members to create files. In real-world scenarios, combining setgid with ACLs (e.g., setfacl -m g:devteam:rwx) provides finer-grained control, but the standard Unix permission model with setgid is the simplest and most common solution for shared project directories.
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
- →
User and Group Management practice questions
Targeted practice on this topic area only
- →
All LFCS questions
513 questions across all exam domains
- →
Linux Foundation Certified System Administrator LFCS study guide
Full concept coverage aligned to exam objectives
- →
LFCS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related LFCS practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
User and Group Management practice questions
Practise LFCS questions linked to User and Group Management.
Operation of Running Systems practice questions
Practise LFCS questions linked to Operation of Running Systems.
Essential Commands practice questions
Practise LFCS questions linked to Essential Commands.
Networking practice questions
Practise LFCS questions linked to Networking.
Service Configuration practice questions
Practise LFCS questions linked to Service Configuration.
Storage Management practice questions
Practise LFCS questions linked to Storage Management.
LFCS fundamentals practice questions
Practise LFCS questions linked to LFCS fundamentals.
LFCS scenario practice questions
Practise LFCS questions linked to LFCS scenario.
LFCS troubleshooting practice questions
Practise LFCS questions linked to LFCS troubleshooting.
Practice this exam
Start a free LFCS practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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 proj1 directory lacks group write and execute permissions; use chmod g+rwx proj1 and chmod g+s proj1 to allow group members to create files and ensure new files inherit group. — Option D is correct because the project subdirectory /data/projects/proj1 has permissions drwx------ (700), which means only the owner (lead1) has read, write, and execute access. The devteam group lacks both write and execute permissions, preventing group members from creating files. The solution is to add group write and execute permissions (chmod g+rwx proj1) and set the setgid bit (chmod g+s proj1) so that new files inherit the group ownership, ensuring all devteam members can create files while only the owner can delete them.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 →
Last reviewed: Jun 11, 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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.