Lập trình Shell: Game Tài Xỉu mô phỏng thật có 3 xí ngầu

#!bin/bash
#Bai 1: Game tai xiu va tinh tong tien an hay thua
read -p "Nhap so tien ban dang co: " tong
von=$tong
clear
PS3="Ban chon TAI hay XIU hay TONGKET[1/2/3] :"
menu=("Tai" "Xiu" "Tong_ket")
select chon in "${menu[@]}"
do
case $chon in
"Tai")
read -p "Ban chon tai, so tien muon cuoc: " c
while [ $c -gt $tong ]
do
read -p "Co $tong ma doi dat $c ha, moi cuoc lai: " c
done
x1=$((RANDOM%6+1)) && echo Xi ngau 1: $x1
x2=$((RANDOM%6+1)) && echo Xi ngau 2: $x2
x3=$((RANDOM%6+1)) && echo Xi ngau 3: $x3
(( r = $x1 + $x2 )) && (( r = $r + $x3 ))
if [ $x1 = $x2 ] && [ $x2 = $x3 ] ; then echo Bao lon! Cai an het && (( tong = $tong - $c ))
else
if [ $r -ge 11 ]
then echo "    $r=========> TAI! Ban thang $c dong" && (( tong = $tong + $c ))
                else echo "    $r=========> XIU! Ban thua $c dong" && (( tong = $tong - $c ))
fi
fi
echo --------So tien ban dang co: $tong
if [ $tong = 0 ] ; then echo "Ban da het tien, xin tam biet! " && exit
fi
;;

"Xiu")
read -p "Ban chon tai, so tien muon cuoc: " c
        while [ $c -gt $tong ]
        do
                read -p "Co $tong ma doi dat $c ha, moi cuoc lai: " c
        done


x1=$((RANDOM%6+1)) && echo Xi ngau 1: $x1
        x2=$((RANDOM%6+1)) && echo Xi ngau 2: $x2
        x3=$((RANDOM%6+1)) && echo Xi ngau 3: $x3
        (( r = $x1 + $x2 )) && (( r = $r + $x3 ))
        if [ $x1 = $x2 ] && [ $x2 = $x3 ] ; then echo Bao lon! Cai an het && (( tong = $tong - $c ))
        else
                if [ $r -le 10 ]
                then echo "    $r=========> XIU! Ban thang $c dong" && (( tong = $tong + $c ))
                else echo "    $r=========> TAI! Ban thua $c dong" && (( tong = $tong - $c ))
                fi
        fi
        echo --------So tien ban dang co: $tong
        if [ $tong = 0 ] ; then echo "Ban da het tien, xin tam biet! " && exit
        fi
  ;;

"Tong_ket")
(( tongket= $tong -$von ))
if [ $tongket -ge 0 ]
then echo "--------Tong so tien ban thang trong game la: " $tongket
else ((tongket=$tongket \* -1 )) && echo "--------Tong so tien ban da thua trong game: " $tongket
fi
read -p "Ban co muon choi tiep? [y/n]" a
        while [ $a != 'y' ]
        do
if [ $a = 'n' ] ; then exit
         fi
                read -p "Moi nhap lai [y/n] :" a
        done
;;

*)
echo Chon sai, xin chon lai:
;;
esac
done