How do you verify if in 32 or 64 bit mode?

Just received my new 12 core Mac Pro. I understand they boot into 64 bit mode by default. How do I verify it is in 64 bit mode?

Open a terminal shell and type:
sudo systemsetup -setkernelbootarchitecture x86_64
To go back to the 32-bit kernel type:
sudo systemsetup -setkernelbootarchitecture i386
You can also hold down the 3 and 2 keys and/or 6 and 4 keys at boot but it will revert back to systemsetup setting if you do not specify at boot.
Keep in mind very few things actually benefit from running with the 64-bit kernel. I use 32 at the moment as I have some really old VPN software that wont initialize under 64-bit. 64-bit should not be confused with "It's faster".

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