This LPIC-2 practice question tests your understanding of block devices, filesystems and advanced storage. 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 can be used to display all UUIDs of block devices that contain filesystems?
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.
lsblk -f
Why wrong: lsblk -f also shows UUIDs, but the best answer is both A and B.
both A and B
Both blkid and lsblk -f display UUIDs.
blkid
Why wrong: blkid does show UUIDs, but the best answer is both A and B.
fdisk -l
Why wrong: fdisk -l does not show UUIDs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
both A and B
Both `lsblk -f` and `blkid` are designed to display UUIDs for block devices that contain filesystems. `lsblk -f` shows filesystem information including UUIDs in a tree-like format, while `blkid` directly queries the UUID and filesystem type from block device metadata. Option B is correct because both commands fulfill the requirement.
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.
lsblk -f
Why it's wrong here
lsblk -f also shows UUIDs, but the best answer is both A and B.
both A and B
Why this is correct
Both blkid and lsblk -f display UUIDs.
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.
blkid
Why it's wrong here
blkid does show UUIDs, but the best answer is both A and B.
fdisk -l
Why it's wrong here
fdisk -l does not show UUIDs.
Common exam traps
The trap here is that candidates often think only one command (usually `blkid`) can display UUIDs, forgetting that `lsblk -f` also shows this information, leading them to pick a single option instead of the combined answer.
Trap categories for this question
Command / output trap
lsblk -f also shows UUIDs, but the best answer is both A and B.
Detailed technical explanation
Under the hood, `blkid` reads the filesystem superblock (e.g., ext4 superblock at offset 0x468 for UUID) using libblkid, while `lsblk -f` leverages the same library but also queries sysfs and udev for additional device topology. A subtle behavior: `blkid` may show cached results from the blkid cache file (/etc/blkid/blkid.tab) unless run with `-p` to bypass cache, which can cause stale UUIDs if the filesystem was modified offline. In real-world scenarios, using `lsblk -f` is often preferred for scripting because it outputs consistent columnar data, while `blkid` is better for single-device queries.
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-2 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
Block Devices, Filesystems and Advanced Storage — This question tests Block Devices, Filesystems and Advanced Storage — Read the scenario before looking for a memorised answer..
The correct answer is: both A and B — Both `lsblk -f` and `blkid` are designed to display UUIDs for block devices that contain filesystems. `lsblk -f` shows filesystem information including UUIDs in a tree-like format, while `blkid` directly queries the UUID and filesystem type from block device metadata. Option B is correct because both commands fulfill the requirement.
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-2 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-2 exam.
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