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How to Check the Linux OS bit version

Hi Friends here we will check how to identify the Linux kernel architecture, i.e. it is 32 bit or 64 bit version.
We will show you several different ways of checking whether your system is  32-bit or 64-bit.

Uname


The first two methods involves the “uname” command, which prints system information to the screen. If you want more information than just whether your system is 32-bit or 64-bit, type the following command and press Enter.

uname –a
The following information is printed to the screen in the following order: kernel name, network node hostname, kernel release, kernel version, machine hardware name, processor type, hardware platform, operating system.


To use the “uname” command to only find out whether your system is 32-bit or 64-bit, type the following command and press Enter.

uname –m
This displays only the machine hardware name and indicates, as above, whether your system is 32-bit (“i686” or “i386”) or 64-bit (“x86_64”).


Arch


The “arch” command is similar to the “uname -m” command and prints to the screen whether your system is 32-bit (“i686”) or 64-bit (“x86_64”). Type the following command and press Enter.

arch

Getconf


The simplest way is to run "getconf LONG_BIT" which will output 64 or 32 depending on whether it is 32 or 64 bits.


To determine if the hardware is capable of running a 64-bit kernel

x86_64 GNU/Linux indicates that you've a 64bit Linux kernel running. If you use see i386/i486/i586/i686 it is a 32 bit kernel.
Look for the following in the output of command "grep flags /proc/cpuinfo"

grep flags /proc/cpuinfo
  • lm flag means Long mode cpu - 64 bit CPU
  • tm flag means Protected mode - 32-bit CPU
  • rm flag means Real Mode - 16 bit CPU
For more flag related info please check, What do the flags in /proc/cpuinfo mean?

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