Kyle Evans 5b80de237b cron: add log suppression and mail suppression for successful runs
This commit adds two new extensions to crontab, ported from OpenBSD:
- -n: suppress mail on succesful run
- -q: suppress logging of command execution

The -q option appears decades old, but -n is relatively new. The
original proposal by Job Snijder can be found here [1], and gives very
convincing reasons for inclusion in base.

This patch is a nearly identical port of OpenBSD cron for -q and -n
features. It is written to follow existing conventions and style of the
existing codebase.

Example usage:

# should only send email, but won't show up in log
* * * * * -q date

# should not send email
* * * * * -n date

# should not send email or log
* * * * * -n -q date

# should send email because of ping failure
* * * * * -n -q ping -c 1 5.5.5.5

[1]: https://marc.info/?l=openbsd-tech&m=152874866117948&w=2

PR:		237538
Submitted by:	Naveen Nathan <freebsd_t.lastninja.net>
Reviewed by:	bcr (manpages)
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D20046
2019-09-25 02:37:40 +00:00
2019-09-10 21:08:17 +00:00
2019-09-10 17:40:53 +00:00
2019-09-16 22:48:40 +00:00
2019-09-10 21:08:17 +00:00
2019-09-03 19:42:04 +00:00
2019-09-18 02:03:39 +00:00
2016-09-29 06:19:45 +00:00
2017-12-19 03:38:06 +00:00
2019-01-01 00:25:25 +00:00
2018-06-09 03:08:04 +00:00
2019-09-10 17:40:53 +00:00
2019-09-16 12:44:44 +00:00

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