[9fans] POSIXy V7 sh

[Geoff Collyer <geoff@collyer.net>]

This isn't directly Plan 9 related, but may be of interest
to this audience.  Brantley Coile asked me a few months back
if I had a simple (Unixy) shell for modern Unixes, which prompted me
to retrofit the memory-management, directory-reading and a few other
changes described in `A Partial Tour Through the UNIX Shell' into
the V7 shell (now that it's freely available courtesy of SCO).
It should run on POSIXy systems and been run under APE and on the
BSDs and Linux on x86 PCs without trouble.  Among its other features,
it lacks the GNU readline library, so what you type is what you get.
It's also smaller than even rc (at least on Plan 9):

	; size /bin/v7sh /bin/rc
	69771t + 13580d + 5756b = 89107	/bin/v7sh
	81881t + 10268d + 13528b = 105677	/bin/rc

You can find it at http://www.collyer.net/~geoff/v7sh.tar.