Overview
lsblk (list block devices) is a command that provides information about block devices (hard disks, SSDs, USBs, CD-ROMs, etc.) and their associated partitions. It visualizes all block devices, including file systems and logical volumes, in a hierarchical tree structure, making it easy to understand the structure of storage devices connected to the system. Unlike `df`, which shows file system usage, `lsblk` focuses on displaying the physical structure of the devices themselves.
Key Features
The key features of the lsblk command are as follows:
- Displays all block devices and partitions in a tree structure.
- Provides information such as device name (NAME), size (SIZE), and mount point (MOUNTPOINT).
- Detailed information such as partition table type, and whether the device is rotational or non-rotational can be checked.
- Also supports output in JSON format for easy use in scripts.
Key Options
The main options of the lsblk command are grouped by purpose.
1) Output Format Control
2) Filtering and Sorting
3) Help
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Description:
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Usage Examples
Learn the functions of the lsblk command through various usage examples.
Display Basic Block Device Information
lsblkThe most basic usage, showing all block devices in a tree structure.
Display with File System Information
lsblk -fDisplays additional file system (FSTYPE), UUID, and LABEL information for the device to provide more detailed insights.
Display Specific Information Only
lsblk -o NAME,SIZE,MOUNTPOINTUses the `-o` option to display only the device name, size, and mount point.
Find Device with Root Directory
lsblk -o NAME,SIZE,MOUNTPOINT | grep '/'Checks device information where the root directory (`MOUNTPOINT=/`) is mounted.
JSON Output for Script Usage
lsblk -JOutputs command results in JSON format, making them easy to parse in scripts.
Tips & Cautions
Summarized important points to note when using the lsblk command.
Tips
- lsblk is very useful for understanding disk status when used with `df`. It's a method of checking the physical device structure with `lsblk` and file system usage with `df`.
- lsblk output can be viewed without `sudo` privileges, so there are few cases where information cannot be checked due to permission issues.
- In a virtual environment, it shows information about virtual disks (`vda`, `sda`, etc.), which may differ from actual physical disks.