shell随机数比较

 #!/bin/bash

 a=$(expr $RANDOM % )   #生成一到一百的随机数

 echo $a   #打印随机数

 b=

 while true

 do

         let b++

         echo "比较了第$b次!"

         read -p "请输入一个1-100的随机数数: " num

         if [ $num -gt  ]; then

                 echo "输入错误!请重新输入!"

                 continue

         elif [ $num -le  ]; then

                 if [ $num -lt $a ]; then

                         echo "sorry,小了"

                 elif [ $num  -gt $a ]; then

                         echo "sorry,大了"

                 elif [ $num -eq $a ]; then

                         echo "恭喜,俩个数相等,获得大奖"

                         break

                 fi

         fi

 done