shell腳本小遊戲：剪刀石頭布

#!/bin/bash
ww=(剪刀 石頭 布)
num=$[RANDOM%3]
computer=${ww[$num]}

echo "1.剪刀"
echo "2.石頭"
echo "3.布"

read -p"輸入1-3：" mt

case $mt in
1)
        if [ $num -eq 0 ]
        then
            echo "平局"
        elif [ $num -eq 1 ]
        then
            echo "你贏"
        else
            echo "計算機贏"
        fi
        ;;

2)
        if [ $num -eq 0 ]
        then
            echo "你贏"
        elif [ $num -eq 1 ]
        then
            echo "平局"
        else
            echo "計算機贏"
        fi
        ;;

3)
        if [ $num -eq 0 ]
        then
            echo "計算機贏"
        elif [ $num -eq 1 ]
        then
            echo "你贏"
        else
            echo "平局"
        fi
        ;;

*)
        echo "請輸入1-3: "
esac