To activate dark mode in OS X Yosemite you have to take many steps, Apple doesn’t made it possible to activate dark mode with a hotkey. You can activate itself with the following command. Launch Terminal and enter the following command.
Mac OS X General
Re-activate the Shutdown Dialog
When you press the power button on your Mac (installed with OS X Mavericks or Yosemite) your Mac falls into sleepmode. You can disable the power button’s directly sleep mode and have the ‘old’ shutdown dialog appearing instead, open OS X Terminal window and enter:
Disable ‘Stay on front’ for OSX help windows
When opening the help window in OS X, the window will always open and stays on the front. This can be very frustrating, so you can use the following command in Terminal to get the help-center window behave like all other windows in OS X.
How to enable OS X Yosemite’s new dark mode (beta version)
Apple announced OS X 10.10 Yosemite earlier this month at WWDC with a whole new light and flat design. They also announced a new “Dark Mode” that’ll make the interface little bit darker. The setting was however not available in the first beta of OS X Yosemite, but you can enable it in the second beta with the following command:
10.9: Disable App Nap in OS X
App Nap helps you save power and battery life when you’re working with multiple apps at the same time. You can disable this feature for each application by using the info window in the Finder (select the app in Finder and activate this window with cmd⌘ + i). With the following command you can disable App Nap system wide.
10.9: Stop the power button from putting your mac in stand-by (sleep) mode (archive)
Since OS X 10.9 mavericks, the behavior of the power button has changed. Now, when you quickly press this button, it will OS X be placed in standby mode. With the following command you can use the power button function rollback to previous versions of OS X.
Give OS X a flatter look inspired by iOS 7
The default theme in OS X still has, despite the change in iOS 7, lots of shades and gradient effects incorporated in the theme. This can be disabled by using a terminal command and give the finder window and a few other programs a flatter look. The resulting appearance is flatter and whiter window that’s showing brighter colors and less shadowing. Add the following command in Terminal: