random from within the range at file read time. Very useful if you
want to avoid having a fleet of machines melt a server by all trying to
contact it at a precise time every morning. See docs for details.
Reviewed by: christos, apb, vixie, others.
XXX apb suggests, quite reasonably, that ?10-16/2 should mean
something like 10,12,14,16 or 11,13,15. I'm too lazy to do it right
now, but it should be done.
XXX vixie suggests, quite reasonably, that if you're using "?" one
should delay randomly by 0-59 seconds. In the modern NTP world, you
could imagine that with a million well synchronized machines the
second just at the minute would be hit quite hard. I'm too lazy to do
it right now, but it should be done.
XXX cron needs to be updated to Vixie's cron 4.1 code.
execution. CRON_TZ sets the time zone within which a job is
considered for execution (but not in which it runs), and CRON_WITHIN
allows jobs to be skipped whose execution is delayed for any reason
(eg, the system was sleeping or the load average is too high for
timely execution).
