Select About This Mac from the Apple menu (the Apple icon in the top left), and a window will appear containing your version number. If it's 10.2.x, you're running Jaguar, if it's 10.3.x, you're running Panther, if it's 10.4.x, you're running Tiger, and if it's 10.5.x you're running Leopard (you lucky dog you).

Which cat do you have?
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What Cat do i have ?
Submitted by Anonymous (not verified) on Mon, 2007-11-12 16:08.
Are you retarded ?
In the Apple Menu, check "About this Mac"
It's dead simple.
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And then...
Submitted by Anonymous (not verified) on Mon, 2007-11-12 21:48.
And if you want more information about which operating system your mac is running, click on the line that lists the version and you'll get the build number and sometimes more.
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Wow this guy is a regular
Submitted by Anonymous (not verified) on Wed, 2008-03-12 11:18.
Wow this guy is a regular dickhead. I found this page today becuase I am working on a MAC today, and this site gave me the exact answer that I needed.
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Jeez. Really? Why don't you
Submitted by Anonymous (not verified) on Tue, 2007-11-13 06:33.
Jeez. Really? Why don't you start telling people how to do things like take their Mac out of the box, or how to press the power button. Or maybe something difficult like, right clicking a mouse, or turning the volume knob on their speakers?
Come on, can we get some real content on here? I can't believe the editors let this one go to press.
You guys bore me with this day 1 crap. I've just deleted my bookmark.
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Chill out uber users
Submitted by FCMA (not verified) on Tue, 2007-11-13 10:36.
While I can appreciate the massive knowledge and iterweb skillz as those already posted may have, I thank you for catering to ALL Mac users. Remember folks, you were once noobs too.
Thanks again Mac life. I have added another bookmark for you.
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Command line version check?
Submitted by Gabrielle (not verified) on Tue, 2008-02-26 08:17.
Is there a command that can be used in a shell to determine the version? Thank you.
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Re: Command line version check?
Submitted by HHash on Mon, 2008-08-11 14:20.
You can use sw_vers if you only have ssh access to figure out the OS X version.
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