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How can I tell the version of OS X (and the build) that runs on Recovery HD while I'm running in that mode? The Apple menu has no "About" menu that shows that information when you're running normally.

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The easiest command is to use Terminal - it's under the Utilities menu - and type the sw_vers command:

sw_vers

The output will be the version and build that runs when you boot to Recovery which can be different than the version installed on your main bootable OS X partition.

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