how to identify 32 vs 64 bit CPU?

[Tony Nelson]

At 7:58 AM -0400 8/9/07, 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.

How about uname?  `uname -a` gives all of it.  See `man uname` for subsets
and the ordering of the "-a" output.  If you need more than just x86, I
think any solution will be a bit involved.
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