- A
df -h
Correct: df -h shows filesystem disk space usage in human-readable format.
- B
lsblk
Why wrong: lsblk lists block devices, not usage.
- C
du -h
Why wrong: du shows per-file/directory usage, not filesystem summary.
- D
fdisk -l
Why wrong: fdisk lists partition tables, not usage.
Question 159 of 1,000
XK0-005 System Management Practice Question
This XK0-005 practice question tests your understanding of system management. 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 command displays the amount of disk space used and available on mounted filesystems in a human-readable format (e.g., GB, MB)?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
✓
df -h
The `df -h` command displays disk space usage for all mounted filesystems, with the `-h` flag converting raw block counts into human-readable units like GB or MB. This is the standard Linux utility for reporting filesystem capacity, usage, and available space, making it the correct choice for the question.
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.
- ✓
df -h
Why this is correct
Correct: df -h shows filesystem disk space usage in human-readable format.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
lsblk
Why it's wrong here
lsblk lists block devices, not usage.
- ✗
du -h
Why it's wrong here
du shows per-file/directory usage, not filesystem summary.
- ✗
fdisk -l
Why it's wrong here
fdisk lists partition tables, not usage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `du -h` (which shows directory-level usage) with `df -h` (which shows filesystem-level capacity), leading them to select option C when the question explicitly asks for disk space on mounted filesystems.
Trap categories for this question
Command / output trap
du shows per-file/directory usage, not filesystem summary.
Detailed technical explanation
How to think about this question
Under the hood, `df` reads filesystem statistics from the `statfs()` system call, which retrieves block counts from the superblock. The `-h` flag converts these raw 1024-byte blocks into IEC or SI units (e.g., GiB or GB) based on the `POSIXLY_CORRECT` environment variable. In real-world scenarios, `df -h` is essential for quickly identifying filesystems that are nearly full, which can cause application failures or system instability.
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 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
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.
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System Management — study guide chapter
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System Management practice questions
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FAQ
Questions learners often ask
What does this XK0-005 question test?
System Management — This question tests System Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: df -h — The `df -h` command displays disk space usage for all mounted filesystems, with the `-h` flag converting raw block counts into human-readable units like GB or MB. This is the standard Linux utility for reporting filesystem capacity, usage, and available space, making it the correct choice for the question.
What should I do if I get this XK0-005 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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 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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