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I'm writing a shell script, and I need to know the architecture, i.e. PPC or Intel. Back in the day, there was a program /bin/arch that told you, but my mac doesn't seem to have it... Is there an easy way I can do this? Grep for something in a logfile? call some other program that spits that out as a side effect?

It would be nice to know what OS Version I'm running too, but that may not be necessary.


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up vote 15 down vote accepted

There are many ways, but try uname -a.

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uname -p gives just the processor architecture. man uname for other options. – Doug Harris Jun 3 '10 at 16:55
@DougHarris I get x86_64 with -a but i386 with -p – GP89 Jan 29 '15 at 14:45

arch is available in /usr/bin/arch

You can get OS version information with sw_vers

$ sw_vers
ProductName:    Mac OS X
ProductVersion: 10.6.3
BuildVersion:   10D573
$ sw_vers -productVersion
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uname -m seems to output the same information as /bin/arch.

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Not with me. arch outputs i368 and uname -m outputs x84_86. I run OSX on a 64bit machine. – Erik Aigner Dec 18 '12 at 19:35
@ErikAigner: Typo, perhaps? Shouldn't it be x86_64? – Dennis Williamson Dec 19 '12 at 6:02
Of course arch should return x86_64, that's why it's so strange. But I don't know why. – Erik Aigner Dec 19 '12 at 7:31
Same here: $ uname -m x86_64 $ arch i386 – Davi Lima Jan 21 '15 at 11:31

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