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

1. Print network interface list [[email protected] touch_more]# Ifconfig | cut-c-10 | Tr-d ' | Tr-s ' \ n '
Eth0
lo//cut-c-10;      Outputs the first 10 characters;//tr-d ";     Remove all spaces;//tr-s ' \ n '; Compress duplicate newline characters 2, view name server [[email protected] touch_more]# cat/etc/resolv.conf
# Generated by NetworkManager
Domain Localdomain
Search Localdomain
NameServer 192.168.119.2 3, DNS lookup [[email protected] 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

[email protected] 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
[Email protected] 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;" >[[email protected] 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)