List the devices in linux

How to List all Linux Disk Devices

How to list disk devices in Linux with lsblk

The proper way to list block devices such as hard disks is using the command lsblk.

Note: the -a flag forces lsblk to list also empty devices.

In the first column you can see all the connected devices, in the image above you can see 3 devices: sda, sdc and sdd. Lets see some information on each.

Lsblk, The column NAME:

The NAME column shows the name of each disk device and partition. As you can see in the extract of the column below the disk SDA contains 4 partitions: sda1, sda2, sda3 and sda4. You can ignore the “_crypt_” for now.

The second listed disk device is sdc with only one partition, sdc1.

The second listed disk device is sdd with only one partition, sdd1.

The last listed device is the DVD or CDROM:

Lsblk, The column MAJ:MIN:

Following the column NAME there is the column MAJ:MIN is the internal identificator for each device the kernel uses according to the device type.

Lsblk, The column RM:

The column RM shows if the device is removable (where 1 yes and 0 no), in this case last 2 disk are external and the last device is the DVD.

Lsblk, The column SIZE:

The column SIZE displays the size of each of the disk devices listed.

Lsblk, The column RO:

The column RO means Read Only, being 1 positive and 0 negative, if 0 then devices are not read only, if 1, they are read-only.

Lsblk, The column TYPE:

The column TYPE displays the type of device such as devices, partitions, optical devices, encrypted partitions and more.

Lsblk, The column MOUNTPOINT:

The column MOUNTPOINT shows the mount point of each device or partition, the next image shows the partitions of the device sda.

The screenshot below shows an efi partition belonging to sda1, the encrypted sda2 root partition, the sda3 for boot and an encrypted sda4 SWAP.

The flag -l will show the devices and partition as a list rather than as tree:

The flag -f instructs lsblk to inform the filesystem of each partition:

Additional flags for the command lsblk are available and explained in the man page which you can also access at https://linux.die.net/man/8/lsblk.

Listing disk devices in Linux with alternative methods: fdisk and fstab

While the correct way to list disk devices in Linux is using the command lsblk, other options are available.
The first one to try is fdisk, to list all block devices with fdisk run:

How to show free and used space in Linux disk devices

Additionally to listing your storage devices you may need to show the free and used space, this can be achieved using the command df.

As you see in the screenshot below, the availability of space of all disks formerly listed is now displayed.

The command df allows you to easily check each partition identified both by its device name or its mountpoint, yet, the -h option makes it easier to be readed by humans.

For example the image above shows the partition /dev/sda2_crypt which is the root mount point / has 150 GB available and 64 GB used.

About the author

David Adams

David Adams is a System Admin and writer that is focused on open source technologies, security software, and computer systems.

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linux list devices

In Linux various special files can be found under the directory /dev . These files are called device files and behave unlike ordinary files. The most common types of device files are for block devices and character devices.

How much RAM do I have Linux?

To see the total amount of physical RAM installed, you can run sudo lshw -c memory which will show you each individual bank of RAM you have installed, as well as the total size for the System Memory. This will likely presented as GiB value, which you can again multiply by 1024 to get the MiB value.

How do I see devices on Linux?

1. The mount Command. .
2. The lsblk Command. .
3. The df Command. .
4. The fdisk Command. .
5. The /proc Files. .
6. The lspci Command. .
7. The lsusb Command. .
8. The lsdev Command.

How do I create a device on Linux?

1. Build the driver by using Makefile ( sudo make )
2. Load the driver using sudo insmod.
3. Check the device file using ls -l /dev/ . By this time device file is not created for your driver.
4. Create a device file using mknod and then check using ls -l /dev/ .

What are the two types of device files?

Does Linux have a device manager?

There are endless Linux command-line utilities that show the details of your computer’s hardware. . It’s like Windows Device Manager for Linux.

How do I check my RAM size?

Right-click your taskbar and select “Task Manager” or press Ctrl+Shift+Esc to open it. Click the “Performance” tab and select “Memory” in the left pane. If you don’t see any tabs, click “More Details” first. The total amount of RAM you have installed is displayed here.

How much RAM does Windows 10 take up?

In regards to Windows 10 RAM requirements, nowadays most basic Windows 10 systems comes with 4GB of RAM. Especially if you intend to run a 64-bit Windows 10 operating system, 4GB RAM is the minimum requirement. With a 4GB RAM, the Windows 10 PC performance will be boosted.

How much RAM do you need for Ubuntu?

Can Ubuntu run on 1gb RAM? The official minimum system memory to run the standard installation is 512MB RAM (Debian installer) or 1GB RA< (Live Server installer). Note that you can only use the Live Server installer on AMD64 systems. Once again, these are the bare minimum specifications.

Why do people use Linux?

1. High security. Installing and using Linux on your system is the easiest way to avoid viruses and malware. The security aspect was kept in mind when developing Linux and it is much less vulnerable to viruses compared to Windows.

Does Apple use Linux?

Both macOS—the operating system used on Apple desktop and notebook computers—and Linux are based on the Unix operating system, which was developed at Bell Labs in 1969 by Dennis Ritchie and Ken Thompson.

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List USB Devices Linux

In the world of USB computer peripherals, almost everyone uses some sort of USB devices in their computer. These days there are USB webcams, USB hard drives, USB stick also known as PenDrive etc. Almost every device has a USB version of it. So if you’re using Linux, listing what USB device is connected to your system might be necessary at some point.

There are many programs and many ways to list USB devices on Linux.

In this article, I will show you how to list USB devices on Linux. I am using Ubuntu 18.04 Bionic Beaver for the demonstration, but these commands are available on every Linux distribution. So let’s get started.

Listing USB Devices using lsusb Command

The widely used lsusb command can be used to list all the connected USB devices in Linux.

As you can see from the output of the lsusb command in the screenshot below, all the connected USB device is listed. The Bus ID, Device ID, USB ID, and a title is displayed in the output of lsusb command.

As you can see in the marked section of the screenshot below, Realtek Semiconductor Corp. with ID 0bda:57cb, this is my USB Webcam.

You can’t tell that it’s a Webcam by looking at the output of lsusb command, Can you? Nope! So how do I know this? It’s because I checked the output of the lsusb command before and after connecting the USB Webcam and once I compared the outputs, the newly added row is the USB device I connected. Plain! But there are ways to find out what the USB device is.

You can use the dmesg command to find out more information about the connected USB devices. The last connected USB device is the easiest to find with dmesg command. It is more widely used for debugging purpose. You will shortly see why.

You run dmesg command as follows:

As you can see in the yellow marked box in the screenshot below, these are information about the USB device I connected last, which was my USB Webcam. You can see in one of the blue marked box, the USB device I connected is a HD UVC WebCam and its ID is 0bda:57cb.

By now you may have found out that the output of dmesg command is system log messages. Well yes, it is.

You can also search for a specific USB device by its ID in the dmesg system log.

Run the following command to open the output of dmesg command with less text pager:

You should see the following window:

Now to search for a string, press / key on your keyboard. And you should the a / appear on the bottom of terminal window as marked in the screenshot below.

Now type in the USB device ID. For example, earlier when I listed the connected USB devices with lsusb command, one of the USB device had ID 0bda:57cb

Type in the USB Device ID and press . As you can see in the marked section of the screenshot below, the search string is marked white.

You may press and arrow keys to navigate up and down and read through it. You should find a lot of information about that USB device as you can see in the marked section of the screenshot below.

Listing USB devices with usb-devices Command

You can run the following command to list all the connected USB devices of your system:

As you can see in the screenshot below, all the connected USB devices are listed. we can find out pretty much the same information as before with usb-devices command.

Listing Block USB Devices

If you want to list all the USB block storage devices, that is all the USB storage devices, then you can use the lsblk or fdisk command to do so.

Listing USB block storage devices with lsblk:

As you can see in the screenshot below, all the available block storage devices (including the USB block storage devices) are listed.

You can get almost the same information as lsblk command with blkid command. But you have to run it as root as follows:

You can also use fdisk command to list all the USB block storage devices as follows:

As you can see in the screenshot below, the connected block storage devices (including the USB devices) are listed.

That’s how you list all the USB devices on Linux. Thanks for reading this article.

About the author

Shahriar Shovon

Freelancer & Linux System Administrator. Also loves Web API development with Node.js and JavaScript. I was born in Bangladesh. I am currently studying Electronics and Communication Engineering at Khulna University of Engineering & Technology (KUET), one of the demanding public engineering universities of Bangladesh.

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