how to get a word from a line using sed or grep

nagendra · 03-30-2010, 10:10 AM

Hi everyone,

I am struggling with a problem.

I am trying to get a word from a line using sed. Following is the line which I want to use.

inet addr:10.245.86.15 Bcast:10.245.87.255 Mask:255.255.254.0 inet6 addr: fe80::1031:3dff:fe01:55e1/64 Scope:Link

From the above line, I need the ip address like 10.245.86.15 only.

Can u help me in this regard and thanks in advance.

Thanks and Regards,
Nagendra Kumar Aluru

GrapefruiTgirl · 03-30-2010, 10:14 AM

Please show us some of the attempts you have made during your struggle; perhaps we can point out where the problem lies within your code.

And, welcome to LQ

Sasha

crts · 03-30-2010, 10:19 AM

Code:

sed 's/inet addr:\([[:digit:]]\{,3\}\.[[:digit:]]\{,3\}\.[[:digit:]]\{,3\}\.[[:digit:]]\{,3\}\).*/\1/' data_file

This worked.

chrism01 · 03-30-2010, 07:03 PM

Code:

echo $line |cut -d':' -f2|cut -d' ' -f1

nagendra · 03-31-2010, 01:17 AM

Hi GrapefruiTgirl,chrism01 and crts

Thank you very much for your good response.

I am very happy to join LQ.

Now I taken chrism01 code.

Actually I am trying to prepare a script that connects to the remote system through ssh and gets the ip address of the remote system.

I need this ip address to create a firewall rule on Amazon EC2 instances security group.

Since Amazon EC2 instance does not give us a private ip but it gives like domU-xx-xx-xx-xx-xx-xx.compute-1.interna1 which is not useful to set the security group in the CIDR format.

So I prepared the script which launches Amazon EC2 instances automatically and sets their private ip address to security group.
So only my instances can access to each other.

Is there a way to do my activity simply?

Thanks in advance.

Thanks and Regards,
Nagendra Kumar Aluru