Shell Script sending "Null message body; hope that's ok"

jponnusamy · 10-19-2016, 05:38 AM

Hi,
I am not much familer with Shell Scripting. As per requirement we want to monitor Logs and send Alert if specified Error present in the Log. I got below code from some social Network.
The Problem is it's Sending "Null message body; hope that's ok" Message if there is no Errors on the File. We set it in Cronjob, So every 30minutes I am getting Empty Body Mail. We want to ignore null body message. So, Kindly please help on this.

Code:

#!/bin/bash

string='ORA-01591'
pathloc='/opt/apps/shared/opentext/vcm/logs/VgnVCM1-runtime.log'

len=${#string}
if [ ! -e DBErrors ] ; then
                grep $string $pathloc > DBErrors
                mail -s "ORA-01591: lock held by in-doubt distributed transaction Error" Jayaram.Ponnusamy@gmail.com < DBErrors

else

if [ ! -e $string ] ; then
                comm -23 <(grep $string $pathloc) DBErrors | mail -s "ORA-01591: lock held by in-doubt distributed transaction Error" Jayaram.Ponnusamy@gmail.com

fi

               grep $string $pathloc > DBErrors
fi

Thanks

smallpond · 10-19-2016, 06:52 AM

The -e tests if a file exists. Use -s to test that it exists and has non-zero size. Using -e on $string seems wrong to me.

jponnusamy · 10-20-2016, 12:17 AM

Hi,
Thanks for Reply, I tried with -s but that also sending "Null message body; hope that's ok" Mail.

AnanthaP · 10-23-2016, 12:14 AM

Just before sending the mail you want to exclude lines having Null message body; hope that's ok right?

Well one more grep with the -v option that reverses the sense of the search should do it.

OK

PS:
The question is, if the file DBErrors is not going to be used by any other programme, you could apply the grep -v before you write into DBErros.

Likewise for the input of "comm -23" command.

OK

jponnusamy · 10-23-2016, 05:51 AM

Thanks Anantha for the reply,

I fixed this issue by adding -E option in the Mail command to ignore empty body message.

Thanks
Jayaram