LPIC-2 Practice Question: Block Devices, Filesystems and Advanced Storage
Which TWO commands display UUIDs of block devices? (Select TWO)
⚠ Common exam trap
Test-takers frequently confuse partition UUIDs (shown by `fdisk -l` for GPT disks) with filesystem UUIDs, or assume `parted` or `udevadm` are standard tools for listing filesystem UUIDs, when in fact only `blkid` and `lsblk` are the correct commands for that specific task.
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
✓
lsblk -o UUID
B is correct because `lsblk -o UUID` explicitly lists the UUID column for all block devices, showing the filesystem UUIDs. D is correct because `blkid` is the dedicated command to display block device attributes, including UUIDs, by reading the udev database or directly probing the device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
parted /dev/sda print
Why it's wrong here
parted shows partition table but not UUIDs.
- ✓
lsblk -o UUID
Why this is correct
Shows UUID column.
- ✗
udevadm info --query=all --name=/dev/sda
Why it's wrong here
Shows udev information including UUID but not specifically filesystem UUID.
- ✓
blkid
Why this is correct
Displays UUIDs and other attributes.
- ✗
fdisk -l
Why it's wrong here
fdisk -l lists partitions but not UUIDs by default.
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