Checking for new mail...

[dan at rna.UUCP]

	Well to answer my own question, at least partially...
	Berkeley Mail does hand fiddle the atime of the mail file, either
by utime() or by sleep(), open(), read(), as I had guessed. Csh know about
this and gets new mail right.
	USG mail doesn't fiddle with atime, and (at the version I have of)
the Bourne shell can't tell the difference between new mail and a partially
deleted old mail file. Terrible.
	It just seems strange that you can't tell if the last program that
touched a file did only writes, and that mail has to hand fiddle the atime
of a file to get new mail to flag unambiguously.

					Cheers,
					Dan Ts'o
					...cmcl2!rna!dan