Bash scripting help?

[Scarpozzi]

I'm not sure if Bash is the best to use for this. Basically, there's a program running on this system that tells me the status of a tomcat app. I wrote a bash script that executes the program and sends the output to a log file to run nightly in my crontab. I've then setup another script to email me the contents of that file. It works great.

What I want to do now is somehow filter the log file that I created and use the output to decide whether or not I get notified via Email. I need help figuring out the best way to parse the data to then put it through a >= test of some sort.

These are the two lines that I need to filter around. I only need to be Emailed when these numbers are above a certain number...say 100 or 1000. I just need notification that things are queuing up so I can fix whatever's wrong.
Current Total Bytes in System: 0
Current Messages in System: 0

Any ideas on the best way to do this? Would it be easier to do in perl? Thanks,

-Scar

 

[Nothinman]

You can do it, you would just need to use something like cut to extract the numbers into their own variables first.

http://mywiki.wooledge.org/ArithmeticExpression

 

[Scarpozzi]

You can do it, you would just need to use something like cut to extract the numbers into their own variables first.

http://mywiki.wooledge.org/ArithmeticExpression

While I was walking into work today, I thought about extracting the number of messages into sed. It's really the only one that matters... It'd just take a lot of formatting to clear the extra lines that are displayed...about 10 or so. I may give that a try.

Thanks.

-Scar

 

[Nothinman]

Extra lines?

grep -v something | cut -d : -f 1

Or something like that...

 

[Aluvus]

Would it be easier to do in perl?

m/Current Messages in System: (\d+)/ or die "Oh noes!\n";
print $1;

Or if you're being silly and doing something like using commas in the numbers:

m/Current Messages in System: ([\d,]+)/ or die "Oh noes!\n";
print $1;

Or if this is a log file that you append to rather than overwrite, and therefore you want the last instance:

m/.*Current Messages in System: (\d+)/ or die "Oh noes!\n";
print $1;

Optimized for my time, not execution time.

 

[Khyron320]

grep "Bytes in System:" tomcat.log | awk '{ if ($6 > 100) print "Bytes: " $6}'

awk $x prints the value from that colum.

To mail it just pipe it to sendmail

Or am I misunderstanding the question.

 

[Scarpozzi]

grep "Bytes in System:" tomcat.log | awk '{ if ($6 > 100) print "Bytes: " $6}'

awk $x prints the value from that colum.

To mail it just pipe it to sendmail

Or am I misunderstanding the question.

That may be the simplest way... I'm still playing around with the core script to get the environmental variables set correctly for cron, but that's definitely a good starting point. Thanks.

 

[Scarpozzi]

Update: Got everything working a few days ago when I had some free time. Just set the env vars for cron and everything's going great. I'll probably end up with 3 or 4 versions of this script to alert me to different problems within the system...thanks again-

 

[slayer9019]

grep "Bytes in System:" tomcat.log | awk '{ if ($6 > 100) print "Bytes: " $6}'

awk $x prints the value from that colum.

To mail it just pipe it to sendmail

Or am I misunderstanding the question.

^^ yup thats how I would do it