defaults write com.apple.LaunchServices LSQuarantine -bool NO To display the notification again, you enter defaults write com.apple.LaunchServices LSQuarantine -bool YES Remember to restart the setup to work.
30. Change wallpaper when logging in
Some tips for MAC OS Picture 27
The Mac OS boot wallpaper when logged in is pretty nice, but it looks boring sometimes. To change this image, simply go to System > Library > CoreServices and navigate to the DefaultDesktop.jpg file. Change the name of the image you want to DefaultDesktop.jpg and then overwrite the old file. Then restart to see the effect.
See more:
Useful shortcuts for OS X
Use commands and some tips for Mac OS X
Old Mac acceleration runs as fast as when you first bought it with these tips