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["solved"]vixie-cron not working with output redirection
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noclear2000
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PostPosted: Fri Aug 23, 2013 1:45 pm    Post subject: ["solved"]vixie-cron not working with output redir Reply with quote

Hi there,

I am using vixie-cron on my Gentoo installation and I am running lots of jobs with it. Normally I do not want to receive mail about its stdout but only stderr (to be informed about problems).

When I schedule a script I get its output (stdout and stderr) via mail each time it gets executed. So that's just fine:
Code:

0 * * * * /home/thilo/scripts/backup_snapper/make_snapshot.sh


When I try to supress stdout output like this:
Code:

0 * * * * /home/thilo/scripts/backup_snapper/make_snapshot.sh > /dev/null


The script doesn't get executed.

Any idea why?

Cheers,


Last edited by noclear2000 on Fri Aug 30, 2013 12:35 pm; edited 1 time in total
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ulenrich
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PostPosted: Fri Aug 23, 2013 2:07 pm    Post subject: Reply with quote

These look alike crontab entries. This is not a script but a sort of timetable, where you cannot redirect. Consult your vixie-cron docs for loglevel etc ...
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noclear2000
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Location: Germany

PostPosted: Sun Aug 25, 2013 9:28 am    Post subject: Reply with quote

H ulenrich,

Thanks for your reply. Yes, that is a timetable. That's what the crontab is, right?
Code:

root@treehouse [~]# crontab -l | grep make
#0 * * * * /home/thilo/scripts/backup_snapper/make_snapshot.sh > /dev/null
0 * * * * /home/thilo/scripts/backup_snapper/make_snapshot.sh

The commented line wouldn't work. The other works.

Redirecting output in crontab is a pretty basic/standard task, right? I've seen those things daily at work... Why shouldn't it work?

Or do you intend to say rtf vixie-cron m? Is there something written like "unless other cron implementations vixie-cron doesn't support output redirection in crontab"? I will read the docs to find out. :)

If this is misinterpreting your reply, please help me to undertsand it. Thanks a lot!

Cheers
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ulenrich
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PostPosted: Sun Aug 25, 2013 11:45 am    Post subject: Reply with quote

Despite there is an example in usr/share/doc showing redirection of cron entries,
but this example is 20 years old.

The entries of vixie-cron are run by this bash script
/usr/sbin/run-crons
Code:
...
    find ${LOCKDIR} -name cron.$BASE $TIME -exec rm {} \; &>/dev/null || true
...

which shows there is already a redirection to /dev/null.
Probably it isn't possible to re- redirect /dev/null to /dev/null

Solution is to edit one line in /etc/crontab
Code:
*/10  *  * * *  root    test -x  /usr/local/bin/MYruncrons && /usr/local/bin/MYruncrons

cp /usr/sbin/run-crons /usr/local/bin/MYruncrons
vim /usr/local/bin/MYruncrons
... and play with your redirections as you like it!
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noclear2000
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Joined: 21 Jun 2006
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Location: Germany

PostPosted: Fri Aug 30, 2013 12:35 pm    Post subject: Reply with quote

Hi and thanks again for your help.

What I did now is that I did put it all in wrapper script which I scheduled with no redirection. The redirection is done in the wrapper scripts. That works as desired.

Cheers
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