I am using OS X 10.11.3 (15D21) with one monitor and one projector.
Mirroring is turned off.
Mac OS X has an option to switch the main display (the display that has the upper menu) via the System Preferences, as depicted in the attached screenshot:
Basically to switch one drags the little menu bar from one side to the other.
My question is: Is there a way to accomplish this switch via the keyboard or better yet as a command from the Terminal?
Best Answer
hmscreens work great. Here's a sample command line to swap monitors: