The dock should have the applications you commonly need to get to. However, some simply want it to show them the applications that are open. You can do this by running the following command:
defaults write com.apple.dock static-only -bool TRUE
Once run, reboot, or just restart your dock with the following command:
killall Dock
To undo it:
defaults write com.apple.dock static-only -bool FALSE
Shadows make our screen shots look better. But we can’t always use them. There are times when we need to go ahead and disable them due to some reason or another. If you need to disable the shadows on screen captures, you can do so using the following command:
defaults write com.apple.screencapture disable-shadow -bool true
To then enable the shadows, you would use the following command:
defaults write com.apple.screencapture disable-shadow -bool false