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Possible Duplicate:
Is there any way to set a MacBook Pro to not sleep when you close the lid?

I have a Macbook Pro (early 2011) with Mountain Lion installed.

Is there a way to prevent my Mac from going to sleep even on lid close?

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marked as duplicate by user495470, patrix, Mark, bassplayer7, bmike Jan 6 '13 at 1:29

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 5 down vote accepted

If you have an external monitor plugged in, it will happen automatically.

Otherwise, you can use InsomniaX.

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1  
cmdline equivalent is: caffeinate since pmset noidle is deprecated in favor of caffeinate (developer.apple.com/library/mac/documentation/Darwin/Reference/…) – dezza Jul 5 '15 at 17:25

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