Change the background of the login screen

To specify a new picture to use as the background for the login screen, open up Terminal and type…
defaults write /Library/Preferences/com.apple.loginwindow DesktopPicture /path/to/image
If you don’t know the path, instead of typing it, just drag the image you want into the terminal window.

To revert back to the default picture…
defaults delete /Library/Preferences/com.apple.loginwindow DesktopPicture

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