每隔5秒钟监听端口是否活跃

介绍

[TOC]

每隔5秒钟监听端口是否活跃

#!/bin/bash
. /etc/init.d/functions
IPADDR=$1
PORT=$2
 
if [ $# -ne 2 ]; then
    echo "Usage:"
    echo "  $0 [IPADDR|DOMAIN] [PORT]"
    echo ""
    echo "Examples:"
    echo "  $0 localhost 80"
    echo "  $0 192.168.1.1 80"
    exit
fi
 
while :
do
  
    num=`echo -n "\n"|telnet $IPADDR $PORT |grep Connected|wc -l`
    if [ $num -eq 1 ]
    then
       action "network is open." /bin/true
    else
       action "network is closed." /bin/false
    sleep 5
fi
done