Which commands generate and view a filesystem label and UUID for a block device?

• A. Lsblk -f; Blkid /dev/sdX
• B. Blkid /dev/sdX
• C. Lsblk
• D. Blkid /dev/sdX -o export

Answer: (A)

You need to be able to see both the human-friendly name and the unique identifier that a filesystem assigns to a block device. The lsblk tool with the -f option prints a readable table that includes the filesystem type, LABEL, and UUID for each device, giving you a quick, at-a-glance view of what’s on the disk. The blkid command queries a specific device and returns its filesystem metadata, including LABEL and UUID, which is handy when you need the exact values for scripting or mounting. Using these together provides a reliable way to generate and verify the filesystem label and UUID for a block device: lsblk -f for a broad view, and blkid /dev/sdX to confirm the precise values. (If you need a script-friendly format, blkid -o export can be used, but for straightforward viewing, the combination above covers the essentials.)