批量telnet服务端口

当某个服务需要访问比较多的服务时，需要检查端口是否打通。可以使用如下脚本

注意：

　　1、当某个端口不通时，程序会停止运行。

例子：

--服务器列表
cat host.txt
[xxxxxxx@xxxxxxxx ~]$ cat host.txt 
10.10.10.10 50000
10.10.10.10 443


--脚本

#!/bin/bash

while read line
do
	sleep 1
	echo "================begin telnet >>>$line========================="
	echo "exit" | telnet $line
	sleep 1
done < host.txx

--运行过程：

================begin telnet >>>10.10.10.10 50000=========================
Trying 10.10.10.10...
Connected to 10.10.10.10.
Escape character is '^]'.
Connection closed by foreign host.
================begin telnet >>>10.10.10.10 443=========================
Trying 10.10.10.10...
Connected to 10.10.10.10.
Escape character is '^]'.
Connection closed by foreign host.
================begin telnet >>>10.10.10.10 443=========================
Trying 10.10.10.10...
Connected to 10.10.10.10.
Escape character is '^]'.