Paul Vixie - 15 January 1990
Many people have contributed to Cron,
many more than I can remember, in fact.
Rich Salz and Carl Gutekunst were
each of enormous help to me in V1.
Carl for helping me understand UNIX
well enough to write it, and Rich for
helping me get the features right.
John Gilmore wrote me a wonderful review of version 2,
which took me a whole year to answer, even though it
made me clean up some really awful things in the code.
Of course according to John the most awful things are still in there.
Paul Close made a suggestion led to the creation
of /etc/crond.pid and the mutex locking on it.
Kevin Braunsdorf of Purdue made a suggestion
that led to @reboot and its brothers and sisters.
He also sent in some diffs that lead Cron towards
compile-ability with System V, however without
at (1) capabilities, this cron isn't going to be that
useful on System V.
Bob Alverson fixed a silly bug
in the line number counting.
Scott Narveson ported version 2 to a Sequent, and sent
in the single most useful batch of diffs I've ever gotten.
Sequent-verse support added
( may also help on Pyramids )
Sendmail will not timeout if the
cmd is slow to generate output
Misc changes related to the
side effects of fclose()
Crontab says the correct thing when
you do something you shouldn't do
Day-of-week names aren't
off by one day anymore
The Crontab ( 5 ) man page is longer
and it's content is more informative
Null pw_shell is dealt with
now and defaults to /bin/sh