Here is a list of hidden trick for the Mac:
 



Tip 1: Creating a password protected zip file


zip -e [new file name].zip [file path]


 


Tip 2: Expand the Printer Dialog


To Apply: 
defaults write -g PMPrintingExpandedStateForPrint -bool TRUE


To Reverse: 
defaults write -g PMPrintingExpandedStateForPrint -bool FALSE


 


Tip 3: Disable Mac Dashboard Screen


To Apply: 
defaults write com.apple.dashboard mcx-disabled -boolean TRUE; killall Dock


To Reverse: 
defaults write com.apple.dashboard mcx-disabled -boolean FALSE; killall Dock


 


Tip 4: Remove Hidden Dock Mouse Activation Delay


To Apply: 
defaults write com.apple.dock autohide-delay -float 0; killall Dock


To Reverse: 
defaults write com.apple.dock autohide-delay -float 1; killall Dock


 


Tip 5: Remove Hidden Dock Display Delay


To Apply: 
defaults write com.apple.dock autohide-time-modifier -float 0; killall Dock


To Reverse: 
defaults delete com.apple.dock autohide-time-modifier; killall Dock


 


Tip 6: Remove Shadow on Screen Capture


To Apply: 
defaults write com.apple.screencapture disable-shadow -bool TRUE; killall SystemUIServer


To Reverse: 
defaults write com.apple.screencapture disable-shadow -bool FALSE; killall SystemUIServer