proper way to determine arch of *installed* OS, not processor?

[Jesse Palser]

On 05/06/2011 11:14 AM, Robert P. J. Day wrote:
>    what is the proper incantation to determine the word size of the
> installed OS?  that is, if i've installed the 32-bit version of ubuntu
> on a 64-bit system, i want to know that the OS is 32 bits, even as the
> processor is 64 bits.  i'm sure it's some option of "uname", but i
> don't have such a system lying around to test it.  thanks.
>
> rday

Hi,

I did not know either, Google found this:
uname -a
(type in terminal)

Enjoy!

Jesse