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+15 January 1990
+Paul Vixie
+
+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 V2, which took me a whole year to
+answer even though it made me clean up some really awful things in the code.
+(According to John the most awful things are still in here, of course.)
+
+Paul Close made a suggestion which led to /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 some diffs that lead cron toward compil-
+ability with System V, though 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. Brian Reid made suggestions which led to the run queue and
+the source-file labelling in installed crontabs.
+
+Scott Narveson ported V2 to a Sequent, and sent in the most useful single batch
+of diffs I got from anybody. Changes attributable to Scott are:
+ -> sendmail won't time out if the command is slow to generate output
+ -> day-of-week names aren't off by one anymore
+ -> crontab says the right thing if you do something you shouldn't do
+ -> crontab(5) man page is longer and more informative
+ -> misc changes related to the side effects of fclose()
+ -> Sequent "universe" support added (may also help on Pyramids)
+ -> null pw_shell is dealt with now; default is /bin/sh
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