echo "Guess game. What is the number I'm thinking about?"

num=$(($(($RANDOM % 20))+1))

ex=1
while [ 1 -eq $ex ]
do 
	read usr

	if [ $num == $usr ]
	then
		echo "Great it is $num"
		ex=0
	else
		echo "No, it is not that number"
	fi
done