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OS X: Bash function to change the desktop wallpaper across all monitors and spaces. Tested on Mavericks.
# Usage:
# wallpaper path/to/image.png
function wallpaper() {
image=`echo $(cd $(dirname $1); pwd)/$(basename $1)`
cd /System/Library/CoreServices
sudo rm -f DefaultDesktop.jpg
sudo ln -sf $image DefaultDesktop.jpg
sudo rm ~/Library/Application\ Support/Dock/desktoppicture.db
killall Dock
cd -
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