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. 

defaults write com.apple.loginwindow PowerButtonSleepsSystem -bool no

To revert to the original settings:

defaults write com.apple.loginwindow PowerButtonSleepsSystem -bool yes

powerknoporigineel