《Linux Shell腳本攻略》 筆記 第七章：網絡操作

1、列印網絡接口清單

[root@localhost touch_more]# ifconfig | cut -c-10 | tr -d ' ' | tr -s '\n'

eth0

lo

//cut -c-10 ;  輸出前10個字元;

//tr -d ' ' ;      删除所有空格;

//tr -s '\n';     壓縮重複的換行符

2、檢視名字伺服器

[root@localhost touch_more]# cat /etc/resolv.conf

# Generated by NetworkManager

domain localdomain

search localdomain

nameserver 192.168.119.2

3、DNS查找

[root@localhost touch_more]# nslookup www.csdn.net

Server:         192.168.119.2

Address:        192.168.119.2#53

Non-authoritative answer:

www.csdn.net    canonical name = www.csdn.net.aqb.so.

Name:   www.csdn.net.aqb.so

Address: 14.17.69.22

4、列舉出區域網路中同一網段的所有的活動主機

[root@localhost program_test]# cat list_active_hosts.sh

#!/bin/bash

for ip in 192.168.119.{1..255} ;

do

       ping $ip -c 2 &> /dev/null;

       if [ $? -eq 0 ];

       then

               echo $ip is active!

       fi

done

[root@localhost program_test]# ./list_active_hosts.sh

192.168.119.1 is active!

192.168.119.2 is active!

5、系統運作時間監視

<pre name="code" class="plain" style="font-size: 14px;">[root@localhost program_test]# cat ssh_test.sh

IP_LIST="192.168.119.1 192.168.119.2 192.168.119.128"

USER="yxy"

for ip in $IP_LIST;

       utime=$(ssh $USER@$ip uptime | awk '{ print $3 }' )

       echo $ip uptime: $utime