> If I can find a way to append to the input file, I can probably get rid
> of that scraping/parsing code completely.  I came across -dread-file-
> list.  If I understand I would need to create a file:
> 
> ```
> $ cat list-of-files.txt
> first.ly
> song.ly
> last.ly
> ```
>
> And then
>
> ``` 
> lilypond -dread-file-list list-of-files.txt
> ```
>
> However, this doesn't join all the files into one long file.  It
> processes each file on it's own.
> 
> Right now I can do
>
> ``` 
> cat first.ly second.ly third.ly > out.ly
> lilypond out.ly
> ```
>
> But it's not portable.  I'd have to do the equivalent in python if
> there's no way to do it with lilypond.



Not sure I understand the need, why do you need to append at the end, as 
opposed to prepending with -dinclude-settings? (There is no equivalent of 
-dinclude-settings to append.)


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