我的彩票发生器出了问题

Question

我遇到的是没有生成彩票。运行脚本后，系统会提示用户输入MaxValue，NumValues（每行数）以及他们喜欢的彩票号码数。这是有效的，直到我添加了检查以确保非数字值，并且NumValues中的数字大于MaxValue导致错误消息。

#!/bin/bash

echo "Please enter a max random number."
read MaxValue

 if [[ $MaxValue != +([0-9]) ]]
  then
   echo "I can't accept any non-numeric characters. Please try again."
   exit
 fi

echo "Please enter the number of tickets.   "
read NumValues

  if [ $NumValues -gt $MaxValue ]
  then
   echo "The number of values can't be greater than the max random number. Please try again."
    exit
  fi

echo "Please enter how many tickets you'd like. "
read NumSeq

  while [ $NumSeq -gt 0 ]
     do
      touch lotto
      x=$NumValues
      while [ $x -gt 0 ]
      do

      num1=$(($RANDOM * MaxValue))
      num2=$((num1 / 32767))
       if [ `grep -c $num2 lotto` -eq 0 ]
        then
        echo $num2 >> lotto
        x=$((x - 1))
       fi
       done

     NumSeq=$((NumSeq - 1 ))

     echo `sort -n lotto`

     rm lotto
     done