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

[Ralf Mardorf]

On Sun, 13 Dec 2020 16:27:36 +0000, Colin Law wrote:
>On Sun, 13 Dec 2020 at 16:18, Ralf Mardorf wrote:
>>
>> On Sun, 13 Dec 2020 11:44:33 +0000, Colin Law mentioned drop-in
>> directories/files.
>>
>> Those drop-in files are tricky, especially when using a rolling
>> release, but they could cause the same kind of issues for release
>> model distros, probably when upgrading to the next release or when
>> using third party repositories.
>>
>> A famous example is /etc/security/limits.conf.
>>
>> You set all your limits in one place by /etc/security/limits.conf, in
>> my domain e.g. especially "rtprio" and "memlock". Then a
>> packager/vendor decides to override those settings by a drop-in
>> file.  
>
>I have never ever had a problem with other overrides overriding mine.
>It probably depends what sort of system one is setting up.

I agree that it's still not a too big issue nowadays, but it has got
an increasing potential to become a major issue soon or later.

Actually I was bitten by a file located in /etc/security/limits.d/. Not
by an Ubuntu install, but by another major distro's install.