MAC OS X - Shortcut keys Sleep, log out, and shut down

Shortcut	Description
Power button	Tap to turn on your Mac or wake your Mac from sleep.
	Hold for 1.5 seconds while your Mac is awake to display a dialog asking if you want to restart, sleep, or shut down.
	Hold for 5 seconds to force your Mac to turn off.
Command–Control–Power button	Force your Mac to restart.
Command–Option–Power button	Put your Mac to sleep.
Shift–Control–Power button	Put your displays to sleep.
Command–Control–Power button	Quit all apps, then restart your Mac. If any open documents have unsaved changes, you'll be asked whether you want to save them.
Command–Option–Control–Power button	Quit all apps, then shut down your Mac. If any open documents have unsaved changes, you'll be asked whether you want to save them.
Command-Shift-Q	Log out of your OS X user account. You'll be asked to confirm.
Command-Shift-Option-Q	Log out of your OS X user account immediately, without being asked to confirm.

 

Reference:

https://support.apple.com/

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