lsblk

What it does

How to write it

lsblk [OPTION]... [DEVICE]...

Most used

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$ run as a normal user# run as root (or with sudo)

1. 1All disks and partitions

   $lsblk
   NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
   vda           252:0    0   20G  0 disk
   ├─vda1        252:1    0    1G  0 part /boot
   └─vda2        252:2    0   19G  0 part
     ├─rhel-root 253:0    0   17G  0 lvm  /
     └─rhel-swap 253:1    0    2G  0 lvm  [SWAP]
   vdb           252:16   0   10G  0 disk

   vdb has no partitions: a new disk.

2. 2File systems and UUIDs

   $lsblk -f

   FSTYPE, LABEL, UUID, FSAVAIL, FSUSE%, MOUNTPOINTS.

3. 3Only the disks

   $lsblk -d -o NAME,SIZE,MODEL,TRAN

   Model and connection (sata, nvme, usb).

4. 4One disk with full paths

   $lsblk -p /dev/vdb

   Copy the paths for the next commands.

5. 5Choose columns

   $lsblk -o NAME,SIZE,TYPE,FSTYPE,UUID,MOUNTPOINTS

   Just what you need.

6. 6Find empty disks

   $lsblk -dn -o NAME,TYPE,SIZE | awk '$2=="disk"' ; lsblk -f

   A disk with no children and no FSTYPE is unused.

7. 7JSON for scripts

   $lsblk -J -o NAME,SIZE,MOUNTPOINTS | jq '.blockdevices[].name'

   Machine-readable.

8. 8Check SSD TRIM support

   $lsblk -D

   DISC-GRAN not 0 = discard works (fstrim.timer can use it).

9. 9Who owns a device file

   $lsblk -m /dev/vdb

   Owner, group and mode of the device node.

10. 10See the device under a mount point

    $lsblk -s /dev/mapper/rhel-root

    Inverse tree: from the LV down to the disk.

11. 11Find USB disks that are plugged in (security)

    $lsblk -o NAME,TRAN,SIZE,MOUNTPOINTS | grep usb

    Check for unknown removable storage.

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