Re: gzip and old files

[Greg Wooledge <wooledg@eeg.ccf.org>]

On Mon, Aug 19, 2019 at 12:39:47PM -0500, Martin McCormick wrote:
> 	The problem is that in 2002, gzip apparently worked
> differently so if you use modern gzip on it, it just complains

Sounds unlikely.

> $ gzip -d rc.custom.gz
> 
> gzip: rc.custom.gz: not in gzip format

Where did you get this file?  What does file(1) say about it?  How about
gzip --test?

I think it's more likely that your file is corrupt, than that gzip has
decided to become incompatible with itself.