115 January 1990 2Paul Vixie 3 4Many people have contributed to cron. Many more than I can remember, in fact. 5Rich Salz and Carl Gutekunst were each of enormous help to me in V1; Carl for 6helping me understand UNIX well enough to write it, and Rich for helping me 7get the features right. 8 9John Gilmore wrote me a wonderful review of V2, which took me a whole year to 10answer even though it made me clean up some really awful things in the code. 11(According to John the most awful things are still in here, of course.) 12 13Paul Close made a suggestion which led to /etc/crond.pid and the mutex locking 14on it. Kevin Braunsdorf of Purdue made a suggestion that led to @reboot and 15its brothers and sisters; he also sent some diffs that lead cron toward compil- 16ability with System V, though without at(1) capabilities, this cron isn't going 17to be that useful on System V. Bob Alverson fixed a silly bug in the line 18number counting. Brian Reid made suggestions which led to the run queue and 19the source-file labelling in installed crontabs. 20 21Scott Narveson ported V2 to a Sequent, and sent in the most useful single batch 22of diffs I got from anybody. Changes attributable to Scott are: 23 -> sendmail won't time out if the command is slow to generate output 24 -> day-of-week names aren't off by one anymore 25 -> crontab says the right thing if you do something you shouldn't do 26 -> crontab(5) man page is longer and more informative 27 -> misc changes related to the side effects of fclose() 28 -> Sequent "universe" support added (may also help on Pyramids) 29 -> null pw_shell is dealt with now; default is /bin/sh 30