How to Check if Your Linux System is 32-bit or 64-bit

A few commands to see what bit you are running

-bash-4.1# arch
x86_64

-bash-4.1# uname -a

-bash-4.1# file /sbin/init
/sbin/init: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, stripped