由于机房搬迁，需要重新telnet看看网络是否联通

[weblogic@pays03pre_BankVerify /]$ telnet 172.29.1.159 22
Trying 172.29.1.159...
Connected to 172.29.1.159.
Escape character is ‘^]‘.
SSH-2.0-OpenSSH_5.3

1：首先准备hosts文件夹，里面保存所有你要telnet的地址，端口号都是22

2：遍历hosts里面的全部ip，然后将telnet的结果保存在 telnet_result这个文件下面

3：对文件进行二次过滤

  a、看上面的打印结果，如果telnet通了，那么取"]"这个符号上面的一行，也就是Connected to 172.29.1.159.

  b、再通过正则表达式取后面的ip，也就是 172.29.1.159.

　c、再通过"."符号分割，取出1、2、3、4段，然后将通过的地址打印在 telnet_alive.txt这个文件里面，最后将不通的地址筛选出来放在telnet_die.txt里面

脚本：

#! /bin/bash
for i in `cat hosts`
do
sleep 1|telnet $i 22 >> /luyantest/telnet_result.txt
done
cat /luyantest/telnet_result.txt| grep -B 1 \] | grep [0-9] | awk ‘{print $3}‘ | cut -d ‘.‘ -f 1,2,3,4 > /luyantest/telnet_alive.txt
cat /luyantest/hosts /luyantest/telnet_alive.txt | sort | uniq -u > /luyantest/telnet_die.txt

[root@pays03pre_BankVerify luyantest]#
[root@pays03pre_BankVerify luyantest]# cat telnet_alive.txt
172.29.1.159
172.29.1.160
172.29.2.111
[root@pays03pre_BankVerify luyantest]#
[root@pays03pre_BankVerify luyantest]#
[root@pays03pre_BankVerify luyantest]# cat telnet_die.txt
192.168.99.100
[root@pays03pre_BankVerify luyantest]#
[root@pays03pre_BankVerify luyantest]#
[root@pays03pre_BankVerify luyantest]# cat telnet_result.txt
Trying 172.29.1.159...
Connected to 172.29.1.159.
Escape character is ‘^]‘.
SSH-2.0-OpenSSH_5.3
Trying 172.29.1.160...
Connected to 172.29.1.160.
Escape character is ‘^]‘.
SSH-2.0-OpenSSH_5.3
Trying 172.29.2.111...
Connected to 172.29.2.111.
Escape character is ‘^]‘.
SSH-2.0-OpenSSH_6.6.1
Trying 192.168.99.100...