Welcome Jesper!
I don't know much about using the command line. But just thinking it through -- for a batch conversion, how could you give the input name and output name, for all the files, in one command (or one line of code)? I guess maybe the command would reference a file which contains the names of all the files? And also reference a different file which contains the output names???
If that's the case, I wonder if you could just reference the same file for input and output? But that's just a guess, from someone who has never used the commandline (and hardly ever used any kind of terminal).
The only other thing I can think of, is Irfanview. I guess it's essentially an image viewer, but it acts like an editor in many ways. It has a reputation for handling many different image formats. And it has a batch conversion feature as well. I've used that myself, several years ago.
I know it handles SVG, but don't know if specifically PDF to SVG is possible. But I'd be optimistic
http://www.irfanview.com/