shell随机数猜大小

#!/bin/bash
sjs=$(expr $RANDOM % 100)
count=0
echo $sjs
while :
do
        read -ep "请输入一个数字:" num
        let count++
        echo "$num"
        if [ $num -gt $sjs ];then
                echo "大了."
        elif [  $num -lt $sjs ];then
                echo "小了."
        else
                echo "想等了！"
                echo "你总共猜了$count次"
                exit
        fi
done

效果图