From: Marc Weber <marco-oweber@...>
Date: 2012-10-23T05:05:54+09:00
Subject: Re: Looking for suggestions processing and comparing 2 very large files

If they are sorted you can split into pieces, eg create an
a,b,c file and compare a(old) with a(new) and b(old) with b(new) only.

If files are still to big use two chars: aa,ab or the like

Marc Weber