I am using a similar approach. When setting up a new machine, i send each 
config file to RCS before editing. So, when transferring the installation to 
another machine, I can easily identify all changed config files and can even 
transfer the changes via rcsdiff(1) and patch(1).
The tool that I was hoping for, would have made things even more comfortable.

> On 28. Feb 2026, at 00:34, Ian Darwin <[email protected]> wrote:
> 
> One technique I've used in the past is to check only the modified files into 
> git (one might use 'got' today).
> 
> Depending on the degree of trust of where the git repo is (tightly controlled 
> local net vs Github), you should probably add /etc/master.passwd and pwd.db, 
> in fact anything with passwords, private keys, etc. into .gitignore so they 
> don't get revealed.
> 
> On a new machine, I'd:
> 
>     cd /
>     git checkout .../etc_files
>     mv etc_files/.git etc
> 
> Then use combinations of git status, git diff OR diff ./foo ../etc_files, git 
> restore files that you want overwritten with the value from the previous 
> machine, etc. Inevitably some files will change, so commit and push again 
> when you have a workable new system.
> 
> Remember to rm /etc_files when done.
> 
> Read "Reset, restore and revert" in the git doc before you "try this at home, 
> kids".
> 
> It worked OK in the absence of a dedicated tool for the job, which I doubt 
> anyone will actually write.
> 
> YMMV. Use at own risk. Etc.
> 

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