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Prevent a Mac from sleeping from the command line
Authored by: Supp0rtLinux on Jun 24, '13 10:44:15AM

This doesn't JUST cause it not to sleep. It also disables ALL the power management. This can be fine for certain tasks like watching movies, etc but has the downside of draining batteries quickly. Apps that do this for free (like Caffeine) only affect the display power mgmt and even still allow brightness control but still allow fan spin up/down, CPU idle, etc. Great hint for a simple, built-in way to do it. But just be aware that this stops ALL power mgmt function until you hit CTRL-C and will drastically affect battery life on a portable so depending on the usage scenario you may want to keep a power brick around. Doing this will also cause your fans to go full speed which can be noisy.

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