Quick Answer
The answer is `chown` and `chgrp`. Both commands can change the group ownership of a file, though they work differently at the system level. The `chgrp` command is the dedicated tool for altering only the group ID (GID) in the file’s inode metadata, while `chown` can also modify the group when used with a colon followed by the group name, such as `chown :groupname file`. On the CompTIA Linux+ XK0-005 exam, this distinction tests your understanding of file ownership metadata and command syntax—a common trap is assuming only `chgrp` can change the group, but `chown` with the colon syntax is equally valid. To remember this, think of the colon as a separator: `chown user:group` changes both, but `chown :group` changes only the group, making `chown` a dual-purpose tool. For a quick memory tip, recall "chown can own the group too" when you see the colon.
This XK0-005 practice question tests your understanding of security. 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 group ownership of a file? (Choose exactly two.)
chmod
Why wrong: chmod changes permissions, not ownership.
chgrp
chgrp directly changes the group of a file.
groupmod
Why wrong: groupmod modifies group properties, not file ownership.
chown
chown can change group ownership with syntax chown :group file.
usermod
Why wrong: usermod modifies user account properties, not file ownership.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
chgrp
The `chgrp` command is specifically designed to change the group ownership of a file or directory. The `chown` command can also change group ownership when used with the colon syntax (e.g., `chown :groupname file`). Both commands modify the file's group ID (GID) in the inode metadata.
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
Why it's wrong here
chmod changes permissions, not ownership.
chgrp
Why this is correct
chgrp directly changes the group of a file.
Related concept
Read the scenario before looking for a memorised answer.
groupmod
Why it's wrong here
groupmod modifies group properties, not file ownership.
chown
Why this is correct
chown can change group ownership with syntax chown :group file.
Related concept
Read the scenario before looking for a memorised answer.
usermod
Why it's wrong here
usermod modifies user account properties, not file ownership.
Common exam traps
The trap here is that candidates often forget `chown` can change group ownership using the colon syntax (e.g., `chown :group file`), leading them to select only `chgrp` or incorrectly choose `chmod` or `groupmod`.
Detailed technical explanation
Under the hood, both `chgrp` and `chown` call the `chown()` system call, which updates the file's inode with a new GID. A subtle behavior: only the superuser (root) can change the group to a group they are not a member of, unless the filesystem has the `restrict_chown` sysctl disabled. In real-world scenarios, `chown :group` is often used in scripts to avoid the need for a separate `chgrp` command.
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 XK0-005 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
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: chgrp — The `chgrp` command is specifically designed to change the group ownership of a file or directory. The `chown` command can also change group ownership when used with the colon syntax (e.g., `chown :groupname file`). Both commands modify the file's group ID (GID) in the inode metadata.
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 XK0-005 practice question is part of Courseiva's free CompTIA 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 XK0-005 exam.
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