BASH: Extract only IP Address from ip addr command

Hello ,

You can use below shell script to extract only IP address from ip command.

Command :  ip addr show  | grep -oP 'inet \K[^/]+'

Example:

[root@server cgi-bin]# ip addr show  | grep -oP 'inet \K[^/]+'
127.0.0.1
10.0.2.15
192.168.56.102

Note: If you are trying to use ip command in cron jobs, please use as /sbin/ip 

Hope it helps  you. 

Fix: Command not found for whois and dig

Hello,

If you have not installed bind-utils then you wont be able to execute dig commands. basically dig command can be used to DNS information and reverse lookup of a host etc.

To install dig commands , type below commands in your terminal

yum install bind-utils

Then you can try with

dig google.com
dig -x google.com 

If you have executed those commands, you will see sample output as below

and if who is command not working then you have to install jwhois package.

yum install jwhois

and you can test command usage with

whois google.com

Hope it helps you some day!!!!!!!!!!!!!!