Which command shows the LABEL and UUID for a block device?

• A. Lsblk -f
• B. Blkid /dev/sdX
• C. Fdisk -l
• D. Lsblk

Answer: (A)

You want to quickly see a filesystem’s label and its unique identifier. The lsblk command with the -f option does exactly that: it lists block devices and shows filesystem-related information, including FSTYPE, LABEL, and UUID, in a clear, readable table. This makes it straightforward to identify the label you’ve assigned to a filesystem and its UUID, which is handy when mounting by UUID or verifying the filesystem identity.

Other commands don’t fit as neatly for this purpose. Fdisk -l focuses on partition tables rather than filesystem metadata, so it doesn’t reliably show LABEL or UUID. Without -f, lsblk won’t display the LABEL and UUID. The blkid tool can report LABEL and UUID as well, but it’s more verbose and typically used when you’re targeting a specific device rather than getting a quick overview of all devices. So for a quick, authoritative view of label and UUID for block devices, lsblk -f is the best choice.