how to identify 32 vs 64 bit CPU?

[Robert P. J. Day]

On Thu, 9 Aug 2007, Rick Stevens wrote:

> On Thu, 2007-08-09 at 17:50 +0100, Chris Jones wrote:
> > > 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.
> >
> > AFAIK, uname only tells you what you are running, not what you *could*
> > run. I.e. you couldn't tell the diffrence between a 32 bit os on a 64
> > bit capable machine or a 32 bit only machine.
>
> If you get a result from
>
>     cat /proc/cpuinfo | grep " lm "
>
> you're on a 64-bit processor regardless whether it's a 32- or 64-bit OS.
> If you want to know if the OS is 64-bit, then a result from
>
> 	uname -a | grep 64
>
> would indicate a 64-bit OS.

um ... that looks dangerous, since it could find the string "64"
*anywhere" in the output from "uname -a", including in the kernel
version number or elsewhere, no?

if it was 64-bit F7, what *exactly* should "uname -a" print to
identify that?

rday

-- 
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Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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