read -p "Press any key: " DATA echo "Entered key: $DATA"
read -p "Value ? [100]: " DATA echo "Value: ${DATA:-100}"
while read -p "Registration?[Y/n]: " yn do case $yn in "" | [Yy]* ) echo "Complete!" break;; [Nn]* ) echo "Cancel!" exit;; * ) echo "Please answer yes or no.";; esac done