Port knocking in bash

echo "What port knocking sequence do you wish to run?"
echo "1. Open password generator (3141 5926 5358 9793 2384 6264 3383 2795)"
echo "2. Open CP (100 1094 21666 64332)"
echo "3. Close CP (101 1095 21667 64333)"
echo "4. Open HTTP (996 558 223 1097)"
echo "5. Close HTTP (997 559 224 1098)"
echo "6. Open OpenVPN (1178 1196 8844 3345 9612 8956)"
echo "7. Open Converter (8891 8765 9892 5566 1122)"
read numsel
case $numsel in
    1)
        for i in 3141 5926 5358 9793 2384 6264 3383 2795; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    2)
        for i in 100 1094 21666 64332; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    3)
        for i in 101 1095 21667 64333; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    4)
        for i in 996 558 223 1097; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    5)
        for i in 997 559 224 1098; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    6)
        for i in 1178 1196 8844 3345 9612 8956; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    7)
        for i in 8891 8765 9892 5566 1122; do nmap -T5 --system-dns --max-retries 0 -p $i 255.255.255.255; done
        ;;
    *)
        echo "Invalid option"
esac