This LFCS practice question tests your understanding of essential commands. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO commands can be used to change the ownership of a file to a specific user and group? (Select two.)
chown alice:staff file.txt
Changes user to alice and group to staff.
chmod 755 file.txt
Why wrong: Changes permissions, not ownership.
chgrp staff file.txt
Changes group only, but combined with chown user, can achieve ownership change.
usermod -G staff alice
Why wrong: Modifies user's group membership.
passwd alice
Why wrong: Changes user's password.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
chown alice:staff file.txt
Option A is correct because the `chown` command with the syntax `chown alice:staff file.txt` directly changes both the user owner to `alice` and the group owner to `staff` in a single operation. This is the standard and most direct method for changing file ownership in Linux.
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.
chown alice:staff file.txt
Why this is correct
Changes user to alice and group to staff.
Related concept
Read the scenario before looking for a memorised answer.
chmod 755 file.txt
Why it's wrong here
Changes permissions, not ownership.
chgrp staff file.txt
Why this is correct
Changes group only, but combined with chown user, can achieve ownership change.
Related concept
Read the scenario before looking for a memorised answer.
usermod -G staff alice
Why it's wrong here
Modifies user's group membership.
passwd alice
Why it's wrong here
Changes user's password.
Common exam traps
The trap here is that candidates often confuse `chmod` (permissions) with `chown` (ownership), or think that modifying a user's group membership with `usermod` will automatically change file ownership, which it does not.
Detailed technical explanation
The `chown` command updates the inode metadata for the file, specifically the `uid` and `gid` fields, which the kernel uses for access control checks. A subtle behavior is that only the superuser (root) can change the user owner, but a user can change the group owner to a group they belong to if they own the file. In real-world scenarios, `chown` is essential for correcting ownership after file transfers or restoring from backups where UID/GID mappings may differ.
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: chown alice:staff file.txt — Option A is correct because the `chown` command with the syntax `chown alice:staff file.txt` directly changes both the user owner to `alice` and the group owner to `staff` in a single operation. This is the standard and most direct method for changing file ownership in Linux.
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 25, 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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