"at" command and mail
bonomi at mail.r-bonomi.com
Sat Sep 3 20:36:20 UTC 2011
> From owner-freebsd-questions at freebsd.org Sat Sep 3 11:39:54 2011
> Date: Sat, 03 Sep 2011 10:39:44 -0600
> To: questions at freebsd.org
> From: Brett Glass <brett at lariat.net>
> Subject: "at" command and mail
> I'm setting up a FreeBSD appliance that won't be running a mail
> daemon. I'd like the at(8) command to be there for scheduling of
> commands, but do not see any way to prevent it from trying to send
> mail after it executes a command. (There's not even a command line
> option that says "do not mail," or at least I can't find one.) Am I
> missing something, or does at(8) always expect to be able to send
> mail? If so, would it be worth implementing an atrun.conf
> configuration file that makes it optional and possibly sets other
> defaults for at(8)?
Is 'atrun' actually sending the mails or is 'cron' doing it? 'atrun' is
invoked by 'cron', from a specification in the system crontab file.
Cron emails *whenever* a cron-scheduled job produces stdout or stderr
Thus, by modifying the atrun line in crontab, to redirect both stdout
and stderr to /dev/null, you should prvent any 'mailing'.
You could, in theory, have the crontab line _append_ output to a filename
based on a timestamp, however, that intermixes output from all users.
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