How to check 64bit or 32bit CPU ?

Lately I stumbled upon this post on the web:

Hi All,

Any one knows the utility, which will provide info about the
CPU used in the machine is 32 bit or 64 bit ?

Thanks

I was wondering about this myself from time to time…
The good news is – in Linux you can figure that out in no
time by typing:

cat /proc/cpuinfo

If you can find the “lm” flag (lm for long mode) in the flag section, it’s a
64-bit machine. If not it’s most likely a 32-bit box you are dealing with.