blkid Command: Tutorial & Examples
Identify and Manage Filesystem Labels and UUIDs
Have you ever wondered how Linux keeps track of filesystems on your server? How does it uniquely identify each partition
or disk? In the world of Linux servers and virtual machines (VMs), the
blkid command plays a crucial role. It allows
you to identify and manage filesystem labels and universally unique identifiers (UUIDs) associated
with disks and partitions. These identifiers are essential for various operations, such as mounting filesystems
correctly and configuring boot processes. Let's dive into the world of
blkid and explore its power!
blkid command enables you to retrieve information about block devices, including disks and partitions, and display
the associated filesystem labels and UUIDs. By analyzing the filesystem metadata stored on these
blkidprovides you with a concise summary of each block device's attributes, such as the filesystem type,
label, and UUID. With this information, you can easily identify and differentiate between multiple
disks and partitions, even if their device names change or new devices are added.
The importance of
blkid lies in its ability to reliably identify block devices and associate them with the correct
filesystems. It eliminates the need for manual tracking of device names, which can change based on the system's
configuration or hardware changes. Instead, by relying on filesystem labels and UUIDs,
ensures consistency and accuracy in working with disks and partitions. It simplifies tasks like mounting filesystems,
updating configuration files such as
/etc/fstab, and troubleshooting disk-related issues.
Typical Use Cases and Examples
1. Display information for all block devices
To obtain an overview of all block devices and their associated filesystems, simply run the
blkid command without any
This command will list all detected block devices, their filesystem types, labels (if available), and UUIDs. It's an excellent starting point to familiarize yourself with the disks and partitions present on your system.
2. Get information for a specific block device
If you're interested in a specific block device, provide its device name as an argument to
blkid. For example, to
retrieve information about
/dev/sda1, use the following command:
The output will include details such as the filesystem type, label, UUID, and any other attributes associated with the given block device.
blkid in scripts for automated tasks
You can also incorporate
blkid into your scripts to automate tasks like mounting filesystems based on their labels or
UUIDs. Here's an example script that mounts a filesystem by its label:
#!/bin/bash LABEL="data" MOUNT_POINT="/mnt/data" DEVICE=$(blkid -L "$LABEL" -o device) if [[ -z $DEVICE ]]; then echo "Filesystem with label $LABEL not found!" exit 1 fi mount "$DEVICE" "$MOUNT_POINT"
This script retrieves the device associated with the specified label using the
-L option of
blkid. It then proceeds
to mount the filesystem at the desired mount point.
blkid command is an invaluable tool when it comes to identifying and managing filesystem labels
and UUIDs in Linux servers and VMs. By leveraging
blkid, you can simplify disk-related tasks,
ensure consistent filesystem identification, and automate processes based on labels or UUIDs.
Remember to explore the various options and functionalities provided by
blkid to make the most of this powerful