How to Check Linux System is 64 bit or 32 bit

Examples:-

uname is an command line tool useful for displaying system information like kernel-name, kernel version or system architecture etc.

Use following command to find a Linux kernel is based on 64 bit or 32 bit architecture.

# uname -m

x86_64      [ 64-bit kernel ]

# uname -m

i686      [ 32-bit kernel ]