Re: using grep to find IP address...

From: Ed Morton (morton_at_lsupcaemnt.com)
Date: 05/31/05 

Date: Tue, 31 May 2005 11:48:12 -0500

balgach@gmail.com wrote:

> Hello all, i am interested in the last 255 bits of the local machines
> ip address (aka the last number after the period) so far ive been
> using the command, i know all the ip address start with 192.168
>
> ifconfig | grep '192.168' | awk '{print $2}'
>
> which is returning:
>
> inet addr:192.168.0.20

That seems unlikey. awk splits records into fields at spaces by default
and you're only asking it to print one field so seeing output with a
space in that field would be a tad odd.

>
> now how do i get it just to return the '20' ??

Let's assume that the ifconfig line you're interested in looks like this:

        ...
        inet addr:192.168.0.20 Bcast:192.168.99.255 Mask:255.255.255.0
        ...

then your command above:

        ifconfig | grep '192.168' | awk '{print $2}'

would output:

        addr:192.168.0.20

Alternatively, specify either "." or a space char as the separator:

        ifconfig | awk -F"[. ]" '/192.168/{print $5}'

to get an output of just "20". If there's tabs, adjust to suit....

Regards,

        Ed.

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