It’s quite easy to get CPU information in Linux.Just open terminal and give the following command:
$ cat /proc/cpuinfo
Note : Presence of lm(Long mode) in flags indicate that the CPU is 64 bit whereas its absence indicates that it’s a 32 bit processor.
You can also use uname -i command to know whether its a 32 bit or a 64 bit processor.
$ uname -i
It will say “i686” for 32bit and “x86_64” for 64bit.