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How to trap a string in a log file

Posted on 2009-04-02
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Last Modified: 2013-12-06
We have an application that takes a while to start-up. We don't make it available until it is completely back up. The only way to tell that it is up is to tail the log file and wait until we see the "Server startup completed" string. The application is started by running a shell script that we created and we would like to modify it so that the script monitors the log file, and when the "Server startup completed" string is encountered, the script will also make the app available.

Any help in figuring out how to do this would be greatly appreciated.
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Question by:Jorge Fraser
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flow01 earned 2000 total points
ID: 24054252
in ksh
nr_startup_messages=0
while [[ $nr_startup_messages -eq 0 ]] ; do
   nr_startup_messages=`tail -n logfile | grep -c 'Server startup completed'`
   if [ $nr_startup_messages -gt 0 ]
      then
       echo `date` Server startup completed
  else
       echo 'date` Server startup not completed
  fi
  sleep 300 ## wait 5 minutes
done
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