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Crontab 2>&1 not emailing

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# 1  
Old 11-17-2015
Crontab 2>&1 not emailing
I have a script that emails me when I run it manually, but the crontab I'm using must be 'silencing' the output? Here's what I have:

Code:
*/15 * * * * /usr/src/blah.sh > /dev/null 2>&1

I don't want it to email me every time it runs, just when I run the sendmail command inside the script if the conditions in an 'if' statements are true.
# 2  
Old 11-17-2015
First thing I notice is that you are redirecting the output of a script to /dev/null in crontab which does not make much sense to me.
Second, it is a bit difficult to guess what is your script doing without knowing anything it does inside.
Is the same user executing the crontab and the same user that executes the script manually?
# 3  
Old 11-17-2015
What you have is correct. It will redirect any STDOUT and STDERR to the null basket. To restrict cron from emailing add to the cronjob MAILTO="" to disable emailing.

Code:
MAILTO=""
*/15 * * * * /usr/src/blah.sh > /dev/null 2>&1

# Add another MAILTO="some_email_here" for the rest of the jobs
MAILTO="email@me"
* * * * * /path/to/another/script

# 4  
Old 11-17-2015
I see what he means. I got confused with emailing inside the script and emailing outside the script. Thanks Aia.
# 5  
Old 11-17-2015
Every 15 minutes my script does:
Code:
get a temp variable from a sensor

if temp variable > blah; then
          send me a warning email about temp
fi

otherwise just log the temp to a mysql db

So most of the time I don't want an email every 15 minutes that the script ran and logged to the db, just if the temp is high.
# 6  
Old 11-17-2015
The usual problem, your script depends on environment that cron doesn't provide.
To simulate cron, run it with minimal environment in the shell
Code:
env -i PATH=/bin:/usr/bin  /usr/src/blah.sh

# 7  
Old 11-17-2015
Quote:
Originally Posted by unclecameron
Every 15 minutes my script does:
Code:
get a temp variable from a sensor

if temp variable > blah; then
          send me a warning email about temp
fi

otherwise just log the temp to a mysql db

So most of the time I don't want an email every 15 minutes that the script ran and logged to the db, just if the temp is high.
Sorry, but that's no script. That is a plan after which to write a script, at best. Most probably your script bears Cron Problem Number One, but that is just a wild guess as long as you post rubbish instead of your failing script.

I hope this helps.

bakunin
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