> > gzip --compress-like=old-foo foo > > AFAIK thats NOT possible with gzip. Same with bzip2. > Why not.
> I wish it where that simple. > I'm not saying it's simple, I'm saying it's possible. I'm not a compression speciallist but from the theory there is nothing which prevents this except from the actual implementation. Maybe it's time to design a compression alogrithmus which has this functionality (same difference rate as the source) from the ground up. O. Wyss