使用shell脚本编写猜数字

#!/bin/bash
num=$(expr $RANDOM % 100)
chushi=0
echo "$num"
while : 
do
    read -ep "计算机生成了一个 1-100 的随机数,你猜: " num1
    let chushi+=1
    if [ $num1 -eq $num ];then
         echo "恭喜,猜对了"
         echo "总共猜了$chushi次"
         exit
    elif [ $num1 -gt $num ];then
         echo "Oops,猜大了"
    else
         echo "Oops,猜小了"
    fi
done