how to identify 32 vs 64 bit CPU?

[Robert P. J. Day]

On Thu, 9 Aug 2007, Mogens Kjaer wrote:

> Robert P. J. Day wrote:
> >   i'm sure there's a trivial way to do this, but what's a simple way
> > to tell if a system has a 32 or a 64 bit CPU?  something that i could
> > run from within a script.  thanks.
>
> If the script runs on a 64 bit CPU, equipped with a 32 bit OS,
> should it return 32 or 64?

64.  i'm interested in the actual CPU property.

rday