How do I determine whether I run 32 bit oder 64 bit?

Hi guys,
this is probably a very simple question. How do I find out whether my processor runs 32bit or 64bit? Using the Terminal, I can't find that piece of information with system_profiler.
Thank you in advance!

Use the apropos command to list system commands that you do not know exist. For example I used "apropos CPU" and it returned arch. arch is like a manaul way to tell your Mac to use one type of CPU archetecture over another. It's presedence.
This sound dangerous. But it does not really address your question.
Typing arch returns i386 in standard output.
There is a AppleDev pages on this topic -
http://developer.apple.com/documentation/Darwin/Reference/Manpages/man3/arch.3.h tml.
At least I looked.

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Yea,
I bought an original CRT iMac two day's before they were launched, which got the reseller into trouble, and had it replaced by APPLE.
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How do I determine whether I have PCI Express v1.1 or v2.0?
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http://www.amug.org/amug-web/html/amug/reviews/articles/intel/macpro/
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http://www.amug.org/amug-web/html/amug/reviews/articles/intel/macpro-2008/
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http://www.amug.org/amug-web/html/amug/reviews/articles/intel/macpro-2009/
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Thanks. I'm no expert. I don't have a slew of characters before or after my name. This isn't an I'm right/you're wrong situation. I don't claim to know everything - just trying to mitigate the questions I know I'm going to be asked.
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Message was edited by: Ravikumar Allampallam

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Message was edited by: Macthang

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How do I determine whether I run 32 bit oder 64 bit?

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