This LPIC-1 practice question tests your understanding of devices, filesystems and fhs. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
An administrator notices that a large file on an ext4 filesystem is taking up more disk space than expected based on its size. Which command would show the actual disk usage (block allocation) of the file?
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.
ls -l
Why wrong: ls -l shows logical file size, not disk usage.
df -h
Why wrong: df shows filesystem disk usage, not per-file usage.
du -h
du -h displays disk usage in human-readable format for files and directories.
stat
Why wrong: stat shows file size and blocks allocated, but not in human-readable format; du is more direct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
du -h
Option C (du -h) is correct because du (disk usage) reports the actual disk space consumed by a file, including allocated blocks, which can be larger than the file's logical size due to block size overhead, fragmentation, or sparse file handling. On ext4, the default block size is 4096 bytes, so a 1-byte file occupies 4096 bytes on disk, and du reflects this allocation.
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.
ls -l
Why it's wrong here
ls -l shows logical file size, not disk usage.
df -h
Why it's wrong here
df shows filesystem disk usage, not per-file usage.
du -h
Why this is correct
du -h displays disk usage in human-readable format for files and directories.
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.
stat
Why it's wrong here
stat shows file size and blocks allocated, but not in human-readable format; du is more direct.
Common exam traps
The trap here is that candidates confuse logical file size (shown by ls -l) with actual disk block allocation, assuming they are identical, and overlook that du accounts for filesystem overhead like block size rounding and sparse file handling.
Trap categories for this question
Command / output trap
ls -l shows logical file size, not disk usage.
Detailed technical explanation
The du command reads the stat.st_blocks field from the stat() system call, which counts the number of 512-byte blocks allocated to the file, then multiplies by 512 and divides by the filesystem block size to report actual disk usage. On ext4, this can reveal that a 10 MB file with many small writes may occupy 11 MB due to block alignment, or that a sparse file (e.g., a VM disk image) shows much smaller du output than its logical size. In real-world scenarios, du is essential for identifying files that consume more space than expected, such as log files with many small appends or database files with internal fragmentation.
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 LPIC-1 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
Devices, Filesystems and FHS — This question tests Devices, Filesystems and FHS — Read the scenario before looking for a memorised answer..
The correct answer is: du -h — Option C (du -h) is correct because du (disk usage) reports the actual disk space consumed by a file, including allocated blocks, which can be larger than the file's logical size due to block size overhead, fragmentation, or sparse file handling. On ext4, the default block size is 4096 bytes, so a 1-byte file occupies 4096 bytes on disk, and du reflects this allocation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.
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