change background to scare a friend

changeBackground.sh

#!/bin/bash

USERBACKGROUND=$( gsettings get org.gnome.desktop.background picture-uri )

IMAGES=("wallhaven-466058.png" "wallhaven-284216.jpg" "wallhaven-452660.jpg" "wallhaven-452652.jpg" "wallhaven-418590.jpg" "wallhaven-360663.jpg")
STARTTIME=5

function getImages {
	for i in ${IMAGES[@]}; do
		echo "dowloading https://wallpapers.wallhaven.cc/wallpapers/full/${i} ..."
		wget -q -N https://wallpapers.wallhaven.cc/wallpapers/full/${i}
	done
}

function getRandomImage {
	IMAGE="${IMAGES[$(( ( RANDOM % 6 )  - 1 ))]}"
	echo "'file://$( pwd )/$IMAGE'"
}

getImages

echo "waiting $STARTTIME ..."
sleep $STARTTIME
echo "Let's scare >:D"
while true; do
	RANDOMIMAGE=$( getRandomImage )
	echo "booo >:O"
	echo "-------------------"
	echo "$RANDOMIMAGE"
	echo "..."
	gsettings set org.gnome.desktop.interface enable-animations false
	gsettings set org.gnome.desktop.background picture-uri $RANDOMIMAGE
	sleep 0.15
	echo $USERBACKGROUND
	echo "-------------------"
	echo "Nothing happens, calm down... :D"
	echo "-------------------"
	gsettings set org.gnome.desktop.background picture-uri $USERBACKGROUND
	sleep 2
	gsettings set org.gnome.desktop.interface enable-animations true
	sleep 8
done