shell获得时间戳

starttime=`date +'%Y-%m-%d %H:%M:%S'`
#执行程序
sleep 10
endtime=`date +'%Y-%m-%d %H:%M:%S'`
echo $starttime   $endtime
start_seconds=$(date --date="$starttime" +%s);
end_seconds=$(date --date="$endtime" +%s);
echo "本次运行时间： "$((end_seconds-start_seconds))"s"

根据时间戳比对删掉4个小时前的规则

#!/bin/bash
source /etc/profile
#取负载 进行判断
Load=`uptime |awk -F[,\ .] '{print $17}'`
if [ $Load -gt "10" ];then
  #把tcp连接大于三次的ip存入变量
  tcp_connect_ip=`netstat -ntu|awk '{print $5}'|awk -F: '{print $1}'|awk -F '.' '{print $1"."$2"."$3"."}'|sort|uniq -c|sort -rn|awk '$1>3{print $2}'`
  #进行循环 判断是否是官方蜘蛛和公司ip
  for i in $tcp_connect_ip
  do
     if [[ $i =~ "192.168" ]] || [[ $i =~ "127." ]] || [[ $i =~ "180.76.189." ]] || [[ $i =~ "222.173.94." ]] || [[  $i =~ "172.16.16." ]] || [[ $i =~ "115.208.66.180." ]] || [[ $i =~ "116.179.32." ]] || [[ $i =~ "116.179.37." ]] || [[  $i =~ "220.181.108." ]] || [[ $i =~ "42.236.10." ]] || [[ $i =~ "42.236.43." ]]|| [[ $i =~ "180.163.220." ]] || [[ $i =~ "120.55.93." ]] || [[ $i =~ "180.76.154." ]] || [[ $i =~ "27.223.12." ]] || [[ $i =~ "110.249.201." ]] || [[ $i =~ "110.249.202." ]] || [[ $i =~ "111.225.148." ]] || [[ $i =~ "111.225.149." ]] || [[ $i =~ "220.243.188." ]] || [[ $i =~ "220.243.189." ]]
     then
        echo "$i is ok"
     else
       #精确当前时间
       Time=`date +'%Y-%m-%d %H:%M:%S'`
       #把当前时间做成时间戳
       End_Time=$(date --date="$Time" +%s)
       #把时间戳做成tag 打入到iptables规则中
       iptables -I INPUT -s  `echo $i|sed -nr 's#(.*)\.(.*)\.(.*)\.(.*)#\1.\2.\3.0\/24#gp'` -m comment --comment $(date --date="$Time" +%s) -j DROP
       #根据时间找到四个小时以上的规则进行删除
       iptables-save |grep comment|awk "\$8<$End_Time-14400{print}"|awk '{print "iptables -D " $2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13}'|bash

       
     fi
    done
    #删除重复的规则
    iptables-save|sort|uniq -c|sort -rn|awk '$1>1{print "iptables -D",$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13}'|bash
fi