How-To Check If You’re Running 32 or 64 Bit in Mac OS X

In the terminal type and hit enter:

uname -a

If you’re using a 32 bit Kernel in Mac OS X:


Darwin iMac.local 10.0.0 Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386 i386

If it says i386 on the end there? That indicates it’s the 32 bit kernel.
If you’re using a 64 bit Kernel in Mac OS X:


Darwin iMac.local 10.0.0 Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_X86_64 x86_64

The x86_64 at the end will let you know you are using the 64 bit kernel.

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Posted in Macintosh

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