1、打印网络接口列表

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

eth0
lo

 -c-10 ;  输出前10个字符;

 -d ' ' ;      删除所有空格;

 -s '\n';     压缩重复的换行符

 

2、查看名字服务器

[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、列举出局域网中同一网段的所有的活动主机

[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!