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.
A system administrator needs to change the group ownership of a file to 'developers' and set the setgid bit on a directory. Which two commands accomplish these tasks? (Choose two.)
chmod g+s dir
Sets the setgid bit on the directory.
chmod u+s dir
Why wrong: Sets the setuid bit, not setgid.
chown developers: file
Why wrong: Changes user owner to 'developers', not group.
chown :developers file
Changes group ownership to 'developers'.
chmod g+s file
Why wrong: Sets setgid on a regular file, which has different implications and is not the task.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
chmod g+s dir
Option A is correct because `chmod g+s dir` sets the setgid bit on a directory, causing new files created within it to inherit the directory's group ownership rather than the creator's primary group. This is a standard Linux permission mechanism for collaborative directories.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
chmod g+s dir
Why this is correct
Sets the setgid bit on the directory.
Related concept
Read the scenario before looking for a memorised answer.
chmod u+s dir
Why it's wrong here
Sets the setuid bit, not setgid.
chown developers: file
Why it's wrong here
Changes user owner to 'developers', not group.
chown :developers file
Why this is correct
Changes group ownership to 'developers'.
Related concept
Read the scenario before looking for a memorised answer.
chmod g+s file
Why it's wrong here
Sets setgid on a regular file, which has different implications and is not the task.
Common exam traps
Linux Foundation often tests the distinction between setting the setgid bit on a directory versus a file, and the correct syntax for changing group ownership with `chown :group` versus `chown group:`.
Detailed technical explanation
The setgid bit on a directory (mode 2xxx) is a filesystem feature defined in POSIX. When set, the kernel's `inode` operations enforce group inheritance for newly created files and subdirectories, overriding the process's effective GID. This is commonly used in shared project directories (e.g., `/srv/git`) to ensure all team members can modify files regardless of their primary group. The `chown :developers file` command uses the colon syntax to change only the group, leaving the owner unchanged, which is the precise method for reassigning group ownership.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Essential Commands — This question tests Essential Commands — Read the scenario before looking for a memorised answer..
The correct answer is: chmod g+s dir — Option A is correct because `chmod g+s dir` sets the setgid bit on a directory, causing new files created within it to inherit the directory's group ownership rather than the creator's primary group. This is a standard Linux permission mechanism for collaborative directories.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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