How to get cron job to mail output only if non-empty
On Wed, Mar 4, 2009 at 5:46 PM, Matthew Flaschen <matthew.flaschen@gatech.edu> wrote:
David Karr wrote:
> I have a (root) cron job definition like the following:
>
> 0 0 * * * /usr/bin/clamscan --no-summary -r --reload
> --log=/var/log/clamav/clamscan.log -i / | mail -s "Virus scan found
> something" davidmichaelkarr@gmail.com
>
> This works fine when it finds something (I tested it with a fake virus
> file), but what I didn't expect is that "mail" sends the mail even if the
> output is empty.
You're trying to reinvent the wheel. *Read man cron:
"When *executing *commands, any output is mailed to the owner of the
crontab (or to the user named in the MAILTO environment variable in the
crontab, if such exists)."
Drop the mail -s "Virus scan found something" davidmichaelkarr@gmail.com
and use MAILTO instead. *cron will only send emails there when there is
actual output.
See also http://usertools.plus.net/tutorials/id/1
Thanks, that worked fine.
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