Lao Li share: "Linux shell Script Raiders" Essentials (VI)

1. Print Network interface list
[touch_more]# ifconfig | cut-c-10 | Tr-d ' | Tr-s ' \ n '
Eth0
Lo
www.qixoo.qixoo.com//cut-c-10; The first 10 characters of the output;
Tr-d "; Delete all spaces;
Tr-s ' \ n '; Compress repeated line breaks

2. View Name server
[touch_more]# cat/etc/resolv.conf
# Generated by NetworkManager
Domain Localdomain
Search Localdomain
NameServer 192.168.119.2

3. DNS Lookup
[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. Enumerate all the active hosts of the same network segment in the LAN

[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
[program_test]#./list_active_hosts.sh
192.168.119.1 is active!
192.168.119.2 is active!

5. System Running time monitoring

<pre name= "code" class= "plain" style= "FONT-SIZE:14PX;" >[program_test]# Cat ssh_test.sh
#!/bin/bash

ip_list= "192.168.119.1 192.168.119.2 192.168.119.128"
User= "Yxy"

For IP in $IP _list;
Do
utime=$ (SSH [email protected] $ip Uptime | awk ' {print $} ')
echo $ip Uptime: $utime
Done

Lao Li share: "Linux shell Script Raiders" Essentials (VI)