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Date: Fri, 13 Aug 2010 11:14:03 -0500
From: Mark Tinguely <marktinguely@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: awk problem
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Len Conrad wrote:
> I readfile or pipe this text, in any line order:
>
> rm90.steampick.info
> fgce172.lanejive.info
> smailer1.service.govdelivery.com
> fl49.orangetalon.info
> pollux.carespecial.info
>
> into a program to remove subdomains down to domain.tld :
>
> awk 'FS="." { print $(NF-1)"."$NF }'
>
> and get the first line doubled rather than processed like the other lines:
>
> rm90.steampick.info.rm90.steampick.info
> lanejive.info
> govdelivery.com
> orangetalon.info
> carespecial.info
>
> thanks
> Len
>
> _______________________________________________
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> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
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>   

How about:

 awk -F. '{ print $(NF-1)"."$NF }'