A shell script to set Bing Background as wallpaper automatically on both OSX and Linux (requires wget & jq)

changebg.sh

#!/usr/bin/env bash

if [ "$(uname)" = "Darwin" ]; then

jq=/usr/local/bin/jq
wget=/usr/local/bin/wget

image_folder_path="/Users/$USER/Documents/Images/Bing/"
mkdir -p $image_folder_path

elif [ "$(expr substr $(uname -s) 1 5)" = "Linux" ]; then

jq=/usr/bin/jq
wget=/usr/bin/wget

image_folder_path="/home/$USER/Documents/Images/Bing/"
mkdir -p $image_folder_path

fi

#Get Bing Image JSON
url='http://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt=en-US'
json=$(curl $url)

#Parse Json to get image_address and hash using jq
image_address="http://www.bing.com$(echo $json | $jq '.images[0].url' | sed -e 's/^"//'  -e 's/"$//')"
image_name=$(echo "$json" | $jq '.images[0].hsh' | sed -e 's/^"//'  -e 's/"$//')
image_copyright=$(echo "$json" | $jq '.images[0].copyright' | sed -e 's/^"//'  -e 's/"$//')

#Image Path
image_file_address=$image_folder_path$image_name

#Check image existance
if [ -e "$image_file_address" ]; then
    echo "File exists, Cancel progress."
    exit
else
    echo "File does not exist, Download it."
fi


#Download image
$wget -O $image_file_address $image_address

#set image as background
if [ "$(uname)" = "Darwin" ]; then
    	#Mac OS X
	sqlite3 ~/Library/Application\ Support/Dock/desktoppicture.db "update data set value = '$image_file_address'";
	killall Dock;
	osascript -e 'display notification "'"$image_copyright"'" with title "New background :)" sound name "Ping"'
elif [ "$(expr substr $(uname -s) 1 5)" = "Linux" ]; then
    	#GNU/Linux
	gsettings set org.gnome.desktop.background picture-uri "file://$image_file_address"
	notify-send "New background :)" "$image_copyright"
fi