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Shell script that will alert

Posted on 2014-04-08
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Last Modified: 2014-04-08
I have a script that runs every 10 minutes that looks at a log file. Its not working as I would like. Can you tell me what I'm doing wrong?

In Log:
You would see Completed successfully in which case I want script to shoot me a message.
If there is a failure you would see failed in log which I want it to shoot me a message.
If neither, please dont shoot me a message (process would still be running in which I dont need alert).

Currently I get a message saying completed successfully and when I check it hasnt completed. Im guessing I have it scripted in a way that it will shoot me that alert regardless? Please assist.

failmsg=`tail -6 $1 |grep -i FAILED`
if [[ $? = 0 ]];then
mail -s "Failed... please check..." #@vtext.com < /dev/null
fi

runmsg=`tail -6 $1 |grep -i Completed Successfully`
if [[ $? != 0 ]];then
mail -s "Completed.." #@vtext.com < /dev/null
fi

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Question by:k3vsmith
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Expert Comment

by:Dan Craciun
ID: 39986491
Don't know if that's the issue, but I always used grep with "" or ''.

grep -i "Completed Successfully"
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Author Comment

by:k3vsmith
ID: 39986577
ok I can try that.
Do I need to add in any verbage that if it finds neither to do nothing?
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Expert Comment

by:Dan Craciun
ID: 39986592
Nope.
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Author Comment

by:k3vsmith
ID: 39986597
That didnt send an alert.
For the line you suggested I change I changed like this:
runmsg=`tail -6 $1 |grep -i "Completed Successfully"`


Is that what you meant?
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Expert Comment

by:Dan Craciun
ID: 39986605
Yes.

If you run that line directly, what's the output?

I mean
tail -6 your.log | grep -i "Completed Successfully"
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Author Comment

by:k3vsmith
ID: 39986608
That shows me the line where it says Completed Successfully
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Author Comment

by:k3vsmith
ID: 39986612
So does that mean in the script possibly get rid of the single quotes?
So:
runmsg=`tail -6 $1 |grep -i "Completed Successfully"`
to:
runmsg= tail -6 $1 |grep -i "Completed Successfully"
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Accepted Solution

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Dan Craciun earned 500 total points
ID: 39986613
Then that command was a success, and $? is 0.

You're sending an email only when $? is not 0
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Expert Comment

by:Dan Craciun
ID: 39986617
Did you copy that script from somewhere? Cause it doesn't make much sense to assign a value to a variable (runmsg) and then forget about it...

The reason you were getting that email before was that because you were using an incorrect syntax for grep (unknown parameters because you had a space), it returned an error code.
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Author Comment

by:k3vsmith
ID: 39986625
Oh opps! Haha good catch. That worked. Thanks for your help!
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Author Comment

by:k3vsmith
ID: 39986627
No I just am still learning to script and was trying to hash something out rather than checking my log every so often when I run this process.
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Expert Comment

by:Dan Craciun
ID: 39986641
I would test if that works even before the text "completed" is in the log. I would think it will send you an email regardless of if the text is present or no, just because an empty result is a valid result of grep so $? should always be 0.

I would try something like:
runmsg=`tail -6 $1 |grep -i "Completed Successfully"`
if [[ runmsg != '' ]];then
mail -s "Completed.." #@vtext.com < /dev/null
fi

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Author Comment

by:k3vsmith
ID: 39986645
Oh ok I see what your saying. Let me try that...
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Author Comment

by:k3vsmith
ID: 39986649
Ok so I kicked off process and there would be no fail or successfully in log and ran script. I got no alert. So it must be ok..
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