while true; do
    read input
    case $input in
	selectopt)
	    setsid --fork selectopt
	    ;;
	swatch)
	    SWATCH=$(cat /tmp/swatch)
	    ([ $SWATCH = "0" ] && echo "1" || echo "0") > /tmp/swatch
	    ;;
	*)
	    echo $input
	    ;;
    esac
done