And yet still another, that's right another, bourne shell query

[Dan Bernstein]

'Twould be nice if people used subject lines with more content than the
word ``bourne'' (or perhaps ``csh'').

  Subject: Bourne: How to test if file descriptor 0 is open?

(Not that this plea will have any effect, but it was inevitable that
someone would make this post, so I decided to get it over with.)

---Dan