lsblk

Overview

The lsblk command lists information about all available block devices. It shows the block devices in a tree-like format.

Syntax

lsblk [options] [device...]

Common Options

Option Description
-a Show all devices
-b Print sizes in bytes
-d Don’t show slaves
-f Show filesystems
-m Show permissions
-n Don’t show headings
-o columns Output columns
-p Show full paths
-r Raw output
-t Show topology
-x column Sort by column

Output Columns

Column Description
NAME Device name
MAJ:MIN Major:minor device numbers
RM Removable device
SIZE Device size
RO Read-only device
TYPE Device type
MOUNTPOINT Mount point
FSTYPE Filesystem type
LABEL Filesystem label
UUID Filesystem UUID

Key Use Cases

  1. Device enumeration
  2. Storage management
  3. System configuration
  4. Troubleshooting
  5. Documentation

Examples with Explanations

Example 1: Basic Usage

lsblk

Show block devices

Example 2: Show Filesystems

lsblk -f

Include filesystem information

Example 3: Custom Output

lsblk -o NAME,SIZE,FSTYPE,TYPE,MOUNTPOINT

Select specific columns

Common Usage Patterns

  1. All information:

    lsblk -a

  2. Raw output:

    lsblk -r

  3. Tree topology:

    lsblk -t

Security Considerations

  1. Device access
  2. Root privileges
  3. Sensitive info
  4. Network devices
  5. Removable media

Additional Resources

Best Practices

  1. Regular checks
  2. Documentation
  3. Verification
  4. Monitoring
  5. Change tracking

Device Types

  1. disk
  2. part
  3. lvm
  4. crypt
  5. loop

Troubleshooting

  1. Missing devices
  2. Access errors
  3. Display issues
  4. Format problems
  5. Device naming