Note that the defaults command did not take effect if the System Preferences application is open.

This is helpful to know when watching long videos on your computer. I also use the pmset command to set my Energy Saver preferences to never sleep. This is what I use:

sudo pmset -a -1

-a means apply to battery and outlet powered. -1 loads the custom Energy Saver preferences which in my case all timeouts are set to "Never." I revert this back to normal by using this command:

sudo pmset -a 1

Note that "1" is the "Normal" setting in Energy Saver.

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