How to check what files have been customised in /etc?

[Tom H]

On Mon, Dec 14, 2020 at 2:39 PM Colin Watson <cjwatson at ubuntu.com> wrote:
> On Mon, Dec 14, 2020 at 12:00:13PM +0100, Tom H wrote:
>>
>> 1) Can't you compare the md5sum that's displayed by
>> "grep-status ..." for a package's "<etc-file>" with the output of
>> "md5sum <actual-etc-file>"?
>
> I mean, you can, but all that tells you is that they're identical
> or different.  Chris is trying to find the actual changes to the
> file contents.

I missed that subtlety. Many thanks.