How To Change The Login Window Background Image – Mac OS X Yosemite 10.10.

It took a while for me to find out how to change the login window background image since it has changed so much since OS X Mavericks. I thought I would share how to do this from a terminal window since I found it incredibly useful. is the default Yosemite login window background image. When you delete this file and restart the machine it will be recreated with the image located at /System/Library/CoreServices/DefaultDesktop.jpg.
Since we linked /Library/Desktop\ Pictures/YourNewImage.jpg to /System/Library/CoreServices/DefaultDesktop.jpg, the new background image will be whatever image you used as YourNewimage.jpg.

# Loginwindow background settings #
sudo ln -sF /Library/Desktop\ Pictures/YourNewImage.jpg /System/Library/CoreServices/DefaultDesktop.jpg
sudo rm -rf /Library/Caches/

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