比较外壳中的日期编号和输入编号

Question

www.google.com
current date: 2019-06-12 
exp date: 2019-08-14 
remaining: 63 
date mail select: 63 
not alert

问题是 if 语句的输出不能用作数学逻辑。可能是$diff和 $2(输入(的价值不相等吗？谁能告诉我如何确定它们？

#!/bin/bash
expi=$(echo | openssl s_client -servername $1 -connect $1:443 2>/dev/null | openssl x509 -noout -dates |grep "notAfter" | cut -d= -f2)
expi_date=$(date -d "$expi" +%Y-%m-%d)
current_date=$(date +%Y-%m-%d)
diff=$((($(date "+%s" -d "$expi_date")-$(date "+%s" -d "$current_date"))/86400))
echo $1
echo "current date: "$current_date
echo "exp date: "$expi_date
echo "remaining: "$diff
echo "date mail select: "$2
if [[$diff -eq $2]]
  then
    echo "alert"
  else
    echo "not alert"
fi

Answer 1

请参考以下代码：-

if [ "$diff" -eq "$2" ];
  then
    echo "equal"
  else
    echo "not equal"
fi