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# 1  
Old 02-18-2016
Log script issue
I'm writing a script that will monitor in real time the log file for some messages and then kill the monitor script if it find a particular message. I have written similar type of script and its working for other logs(small log files), but for one particular log the below code is not working. I tried to debug the code and its just hanging after read line command. I have removed unbuffer and tried with tail -f log and it didn't work. Any help would be highly appreciated.

Code:
ID=$$
unbuffer tail -f Server.log | while read LINE
do
   case $LINE in
      *Thread*)
   echo $LINE | awk  -v var="SERVER1"  '{print var,$0}' | egrep -i  "Version|Configuration" >>/tmp/log.txt
   echo $LINE | awk  -v var="SERVER1"  '{print var,$0}' | egrep -i "fgfdg|hellp|message|jjjjjj" >>/tmp/log.txt
     ;;
      *Main*)
    echo $LINE | awk  -v var="SERVER1"  '{print var,$0}' | grep "Server started Successfully" >>/tmp/log.txt
    
    grep "Server started Successfully" /tmp/log.txt
    
    if [  $?  -eq  0  ]
     then
     
    kill $ID
    fi
    ;;

  esac
done


Thanks
# 2  
Old 02-18-2016
How does it differ from the working scripts?
# 3  
Old 02-18-2016
Rudic,

Search strings and log files are different. The other log file is small. I tried with cat command and it worked, but i can't use cat command, have to use tail command. Is my code OK? Any other method?

Thanks

---------- Post updated at 05:56 PM ---------- Previous update was at 04:55 PM ----------

Rudic,

I tried tail -F and it worked. One minor issue is that the below part is not working.
Code:
grep "Server started Successfully" /tmp/log.txt
    
    if [  $?  -eq  0  ]
     then
     
    kill $ID
    fi

I'm looking into it.

Thanks
Last edited by Don Cragun; 02-18-2016 at 09:02 PM.. Reason: Fix CODE tags.
# 4  
Old 02-19-2016
HOW does it NOT work? Any error messages?
Last edited by RudiC; 02-19-2016 at 02:47 AM..
# 5  
Old 02-19-2016
Quote:
Originally Posted by vinus
... ... ...
Rudic,

I tried tail -F and it worked. One minor issue is that the below part is not working.
Code:
grep "Server started Successfully" /tmp/log.txt
    
    if [  $?  -eq  0  ]
     then
     
    kill $ID
    fi

I'm looking into it.

Thanks
Just out of curiosity, why use kill $ID instead of exit?

Is the problem that you think the script is killing itself too soon? Note that you seem to be using the same log file on every run (appending to it instead of recreating it). So, once your script has completed successfully once, the grep will always find what is it looking for immediately on subsequent runs.
Last edited by Don Cragun; 02-19-2016 at 03:30 AM.. Reason: Add conjecture on possible problem.
This User Gave Thanks to Don Cragun For This Post:
vinus
# 6  
Old 02-19-2016
Did you consider doing ALL (or most, at least) of above in one go?
This User Gave Thanks to RudiC For This Post:
vinus
# 7  
Old 02-19-2016
My code is working fine . I have modified my case statement and its working as expected. Thanks

---------- Post updated at 03:17 PM ---------- Previous update was at 03:10 PM ----------

Don,

Thanks for your suggestions. Yes, i can use exit instead of kill id. The old log file will be renamed(with timestamp) on every run.


Thanks
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