Linux core version command

How To Find Which Linux Kernel Version Is Installed On My System

I am a new proud Linux user. My question to you is – how do I check Linux Kernel version? How do I find my Linux Kernel Version installed on my PC? Any help would be greatly appreciated.

Introduction : The Linux kernel is the central (core) component of Linux operating systems. Its responsibilities include managing the system’s resources and the communication between hardware and software components. It also maintains the security of your system. Hence, finding out the version information is a good idea for patching and other sysadmin management tasks.

Tutorial details
Difficulty level	Easy
Root privileges	No
Requirements	None
Est. reading time	1m

Commands to find your Linux Kernel Version

To check Linux Kernel version, try the following commands:

1. uname -r : Find Linux kernel version
2. cat /proc/version : Show Linux kernel version with help of a special file
3. hostnamectl | grep Kernel : For systemd based Linux distro you can use hotnamectl to display hostname and running Linux kernel version

Let us see all commands and examples in details.

How to check kernel version on Linux server/desktop/laptop

You need to use then uname command to print certain system information including kernel name. Type the following command to print kernel version number:
$ uname -r
Sample outputs:

So my Linux kernel version is 4.15.0-39, where:

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• 4 : Kernel version
• 15 : Major revision
• 0 : Minor revision
• 39 : Patch level or number
• generic : Linux distro/kernel specific additional info

Understanding uname command options

To print certain system information you use uname command. It has the following options:

-a, OR —all	print all information
-s, OR —kernel-name	print the kernel name
-n, OR —nodename	print the network node hostname
-r, OR —kernel-release	print the Linux kernel release
-v, OR —kernel-version	print the kernel version
-m, OR —machine	print the machine hardware name
-p, OR —processor	print the processor type or “unknown”
-i, OR —hardware-platform	print the hardware platform or “unknown”
-o, OR —operating-system	print the operating system

Find Linux kernel using /proc/version file

Another option is to type the following cat command:
$ cat /proc/version
Sample outputs:

How to find your Linux Kernel version using hostnamect

Type the hostnamectl command along with grep command:
$ hostnamectl
$ hostnamectl | grep Kernel

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This tutorial is also available in a quick video format:

Conclusion

You learned three diffent commands to display and show Linux kernel version on screen. For more info see the following pages too:

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How to check os version in Linux command line

Check os version in Linux

The procedure to find os name and version on Linux:

1. Open the terminal application (bash shell)
2. For remote server login using the ssh: ssh user@server-name
3. Type any one of the following command to find os name and version in Linux:
   cat /etc/os-release
   lsb_release -a
   hostnamectl
4. Type the following command to find Linux kernel version:
   uname -r

Let us see all examples in details for common Linux distros.

The /etc/os-release file

Type the following cat command:
$ cat /etc/os-release
Sample outputs:

We can filter out information such as OS version and name using the grep command/egrep command as follows:
$ grep ‘^VERSION’ /etc/os-release
$ egrep ‘^(VERSION|NAME)=’ /etc/os-release
Here is what we see:

Even tiny Linux distro such as Alpine Linux provide the required OS (Operating system) information, including version:

Checking OS version on Linux using the lsb_release command

The lsb_release command gives LSB (Linux Standard Base) and distribution-specific information on the CLI. The syntax is:
$ lsb_release -a
Sample outputs:

hostnamectl command

Use hostnamectl command to query and change the system hostname and related settings. Just type the following command to check OS name and Linux kernel version:
$ hostnamectl
And it will give info as follows. Look out for “ Operating System ” and “ Kernel “:

Another outputs from my OpenSUSE Linux 15.2 server:

uname command

/etc/issue file

Use more command/less command as follows:
$ cat /etc/issue
$ more /etc/issue
$ less /etc/issue

Getting help

You can also view the manual page on uname using the following command:
$ man hostnamectl
$ man uname
$ man cat

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Conclusion

We explained how to find and display the OS version on Linux. The safest option is to query /etc/os-release file using grep or cat command. Systemd based Linux distro users can use the hostnamectl command.

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Linux Command: Show Linux Version

[a] uname – Print kernel and system information.

Tutorial details
Difficulty level	Easy
Root privileges	No
Requirements	None
Est. reading time	1m

[b] lsb_release – Print distribution-specific information. [c] /proc/version file – Print running kernel information.

How to check linux kernel version number?

Open a shell prompt (or a terminal) and type the following command to see your current Linux kernel version:
$ uname -r
Sample outputs:

Or type the following command:
$ uname -mrs
Sample outputs:

To print all information, enter:
$ uname -a
Sample outputs:

• 2.6.32-23 – Linux kernel version number
• pae – pae kernel type indicate that I’m accssing more than 4GB ram using 32 bit kernel.
• SMP – Kernel that supports multi core and multiple cpus.

/proc/version file

Type the following command to see Linux version info:
$ cat /proc/version
Sample outputs:

The above output identifies the kernel version that is currently running. It includes the contents of /proc/sys/kernel/ostype , /proc/sys/kernel/osrelease , and /proc/sys/kernel/version files. For example:
$ cat /proc/sys/kernel/
Sample outputs:

Find Distribution Version

Type the following command:
$ cat /etc/*release
OR
$ lsb_release -a
Sample outputs:

Here is another output from my Debian based server:

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Related media

This tutorial is also available in a quick video format:

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How to Check OS Version in Linux

Linux version can be checked using inbuilt commands or can read from specific files. It is important to determine the distribution name and version on many occasion like when doing package updates or OS update.

There are a lot of Linux distributions available like Debian, Ubuntu, CentOS, Mint, Arch, Fedora, RHEL, and more.

In this tutorial, I will show how to check the Linux version from the command line.

Check Linux Version

There are mainly 5 ways we can get Linux distribution name and its version.

1. From /etc/os-release

Use cat command to read the content of the file /etc/os-release , run the following command:

Output from CentOS

Output from Ubuntu

2. Using lsb_release command

The lsb_release -a displays the Linux version information from the command line. The output will display distribution ID, description, release and codename. To display only the description you can use lsb_release -d .

If you get «command not found» and then you need to install ‘lsb-core’ package.

Output of lsb_release -a

To display only the description, run:

3. Using Hostnamectl command

In modern Linux distributions which use systemd init systems, you can use hostnamectl command to display operating system version.

4. From /etc/issue file

You can get version information from /etc/issue file, to read file content use cat or less command:

5. From /etc/*release or /etc/*version

Some distribution use release and version file and those files are specific to that distro.

$ echo /etc/*version /etc/*release
/etc/debian_version /etc/ec2_version /etc/lsb-release /etc/os-release

To read the content from /etc/*release or /etc/*version, run the following command:

If you are interested to know the Linux kernel version and architecture then use uname command or you can read the content from /proc/version file.

Conclusion

In this tutorial, we learned different ways to find Linux OS name and version from I hope you enjoyed reading and please leave your suggestion in the below comment section.

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3 Ways to Check Linux Kernel Version in Command Line

Last updated October 29, 2020 By Abhishek Prakash 25 Comments

Brief: Wondering which Linux kernel version your system uses? Here are several ways to check your kernel version in the Linux terminal.

You may find yourself in a situation where you need to know the exact Linux kernel version being used on your system. Thanks to the powerful Linux command line, you can easily find that out.

Quick way to check Linux kernel version

You can use the following command to get the Linux kernel version:

uname -r

There are other ways to get even more detailed information about kernel. Read the rest of the article to learn it in detail.

In this article, I’ll show you various methods for finding out your kernel version and tell you what those numbers actually mean. If you prefer videos, here’s a quick one. Don’t forget to subscribe to our YouTube channel for more Linux tips.

How to find Linux kernel version

I am using Ubuntu while writing this article. But these commands are generic and can be used on Fedora, Debian, CentOS, SUSE Linux or any other Linux distribution.

1. Find Linux kernel using uname command

uname is the Linux command for getting system information. You can also use it to find out whether you’re using a 32-bit or 64-bit system.

Open a terminal and type in the following command:

The output will be something similar to this:

This means that you’re running Linux kernel 4.4.0-97, or in more generic terms, you are running Linux kernel version 4.4.

But what do the other digits mean here? Let me explain:

• 4 – Kernel version
• 4 – Major revision
• 0 – Minor revision
• 97 – Bug fix
• generic – Distribution-specific string. For Ubuntu, it means I’m using the desktop version. For Ubuntu server edition, it would be ‘server’.

You can also use the uname command with the option -a. This will provide more system information if you need it.

The output of the command should like this:

Let me explain the output and what it means:

• Linux – Kernel name. If you run the same command on BSD or macOS, the result will be different.
• itsfoss – Hostname.
• 4.4.0-97-generic – Kernel release (as we saw above).
• #120-Ubuntu SMP Tue Sep 19 17:28:18 UTC 2017 – This means that Ubuntu has compiled 4.4.0-97-generic 120 times. A timestamp for the last compilation is also there.
• x86_64 – Machine architecture.
• x86_64 – Processor architecture.
• x86_64 – Operating system architecture (you can run a 32-bit OS on a 64-bit processor).
• GNU/Linux – Operating system (and no, it won’t show the distribution name).

But I’ll save you from information overload. Let’s see some other commands to find your Linux kernel version.

2. Find Linux kernel using /proc/version file

In Linux, you can also find the kernel information in the file /proc/version. Just look at the contents of this file:

You’ll see an output similar to what you saw with uname.

You can see the kernel version 4.4.0-97-generic here.

3. Find Linux kernel version using dmesg commad

dmesg is a powerful command used for writing kernel messages. It’s also very useful for getting system information.

Since dmesg provides an awful lot of information, you should normally use a command like less to read it. But since we’re here just to check the Linux kernel version, grepping on ‘Linux’ should give the desired output.

The output will have a few lines but you should be able to identify the Linux kernel version there easily.

How do you check your Linux kernel version and other information?

Of the three ways discussed here, I use uname all the time. It’s the most convenient.

What about you? Which command do you prefer for getting Linux kernel information?

Like what you read? Please share it with others.

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