Linux Command: Show Linux Version

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What command I need to type to display Linux kernel version and other information such as Linux distribution name? How do I check Linux kernel version number?

You need to use the following two commands:

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[a] uname – Print kernel and system information.

[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:

2.6.32-23-generic-pae

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

Linux 2.6.32-23-generic-pae i686

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

Linux vivek-laptop 2.6.32-23-generic-pae #37-Ubuntu SMP Fri Jun 11 09:26:55 UTC 2010 i686 GNU/Linux

Where,

  • 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:

Linux version 3.2.0-0.bpo.1-amd64 (Debian 3.2.4-1~bpo60+1) (ben@decadent.org.uk) (gcc version 4.4.5 (Debian 4.4.5-8) ) #1 SMP Sat Feb 11 08:41:32 UTC 2012

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/{ostype,osrelease,version}
Sample outputs:

Linux
3.2.0-0.bpo.1-amd64
#1 SMP Sat Feb 11 08:41:32 UTC 2012

Find Distribution Version

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

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 10.04 LTS
Release:	10.04
Codename:	lucid

Here is another output from my Debian based server:

lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 6.0.6 (squeeze)
Release:	6.0.6
Codename:	squeeze

Related media

This tutorial is also available in a quick video format:



Video 01: Find The Linux Kernel Version Command Tutorial

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Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.


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19 comment

  1. COluld you please help what explaination it gives regarding version of linux?.

    Linux pd13027a.symphonyteleca.com 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1 01:33:01 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

    Reply

  2. also a simple command that will show the release of the Linux you have:

    $ cat /etc/issue

    output: Red Hat Enterprise Linux Server release x.x

    Reply

    1. How can you be a lonelyDBA when you can provide the perfect answer?

      While we’re at it, what should I do with my life? I know, lazy… ;-)

      Reply

    1. Not sure what you’re asking here exactly. To get a list of the packages installed you can use the rpm command. rpm -qa to query all packages installed (see man pages on command structure).

      Reply

    2. For check OS name simply enter “uname” command & for check packages installed or not we can check with the help of “rpm -qa packagename”.

      Reply

    3. You can get that one from following commands.

      To determine it is SuSE:
      cat /proc/version

      To check SuSE version:
      cat /etc/SuSE-release
      SUSE LINUX Enterprise Server 9 (i586)
      VERSION = 9

      Reply

  8. If we want to search the contents of all of the files in current directory and display the total number of lines in them that contain the string Linux. Which of the below commands will do that

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  9. how to see the version of linux like for ex: redhat 4.4 , redhat 5.4, redhat 5.9
    you know if we make some modifications in /etc/redhat-release v can’t find the correct version like i made some modification redhat enterprises 6.4 to 7.4 all commands are showing this 7.4 version only but not showing original version of that o.s is there any command to see the linux original version please resply for this anybody thank you.

    Reply

  10. by the way in this site u r giving correct information(commands) and easy procedure thanks for that keep going like this thank u admin

    Reply

  11. i have face issue in my xubantu 12.04 64 bit desktop version.
    when i give print command via excel system going to hang or may be not responding.

    Reply

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