Moves screenshot to directory on Mac

screenshot.sh

function mv_screen() {
	# Lecture id for folder
	course="$*"

	# Folder to where captured screenshots are stored
	sf=~/"Desktop"

	# Where images are stored
	path="../Google Drive/Revision/$course/"

	while :
	do
		# Find the newest captured screenshot
		cd "$sf"
		newest=$(ls -t | head -n1)
		if [ "${newest##*.}" != "png" ]; then
		echo "No new screenshot found on the desktop!";

		sleep 10s
		mv_screen $course
		fi

		# Find the last moved screenshot and add +1
		cd "$path"
		latest=$(ls -t | head -n1)
		number=$((1 + ${latest%.png}))
		cd $sf

		mv "$newest" "$path/$number.png"

		echo "Filename: $number.png"
		sleep 10s
	done

}