shell脚本---石头剪刀布

read -p "是否开始游戏(y/n)" a;
while [ $a == y ] ;do
    read -p "
* * * * * * *
*  石头(0)  *
*  剪刀(1)  *
*  布(2)    *
*  退出(3)  *	
* * * * * * *
" b;
c=`echo $[$RANDOM%3]`;
    if [ $b == $c ] ;then
            echo "玩家：$b";
            echo "电脑：$c";
            echo "平局！";
            elif [ $b == 3 ] ;then
            echo "退出游戏！";
    else
            if [ $b == 1 -a $c == 2 ] ;then
                    echo "玩家：$b";
                    echo "电脑：$c";
                    echo "玩家：胜！";
                            elif [ $b == 0 -a $c == 1 ] ;then
                            echo "玩家：$b";
                            echo "电脑：$c";
                            echo "玩家：胜！";
                                    elif [ $b == 2 -a $c == 0 ] ;then
                                    echo "玩家：$b";
                                    echo "电脑：$c";
                                    echo "玩家：胜！";
            else
                    echo "玩家：$b";
                    echo "电脑：$c";
                    echo "电脑：胜！";
            fi
    fi
    if [ $b == 3 ] ;then
            break;
    fi
done

刚刚接触写的不好0.0