🚀 go-pugleaf

I've answered my own question.  (John Immordino at NeXT answered it too, and
it didn't cost me $225---yet 8-) 8-)

At first, I had given up on the Examples, but then I remembered that they
might use vfork instead of fork. Sure enough, a DL search on vfork() turned
up Subprocess.m, which does just what I needed.

It's in Examples/Subprocess.  You send it a shell command, and it vfork()'s,
execs the command in a /bin/sh, sets up a DPSAddFD(), and then sends a
message containing stdout each time appears.

It seems like a pretty nice solution.  If someone has added a lot of
functionality to Subprocess, it'd be a good candidate to the archives.

Thanks to everyone who emailed me suggestions.  Thanks again nets, just
for being there.