I don't have a copy of SVN on this machine to test, but in my own project (based partly on SVN), I noticed this potential problem:

At the command line, the command

COPY FILENAME.EXT

- without a target for the COPY command - produces a zero-byte file with the same name as the file you were trying to copy.

I noticed this when I hit the Enter key by mistake after typing the source filename, before I could type the target filename.

Is this something worth fixing? I think (I'm not at all certain) that at least some versions of DOS gave an error message for an incomplete copy command, and I know that DOSBox doesn't try to duplicate DOS exactly, and that this might not be directly relevant to games. But I think this could easily cause problems for real-world users who tried to copy game-related files but make a mistake while typing.