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Full Discussion: Trouble getting consistent PID of tomcat server from ps
Top Forums Shell Programming and Scripting Trouble getting consistent PID of tomcat server from ps Post 302334394 by dkaplowitz on Wednesday 15th of July 2009 12:08:44 PM
Old 07-15-2009
Trouble getting consistent PID of tomcat server from ps
Hello all,

I am working on a script to automate the process of restarting some tomcat servers. The versions of tomcat are pretty old and it often happens that they don't shut down gracefully and the PID needs to be manually killed. I am having a bear of a time getting a consistent PID from ps though, since sometimes other java processes show up and I get more than one PID from
Code:
`ps -ef | grep [X]ms | cut -c10-14`

(Xms is one of the values from the PID that I thought was unique to the server process, but apparently not since it double matches periodically.)

I have tried all kinds of way to trick it out, but when I run a test like

Code:
while [ `ps -ef | grep [X]ms | cut -c10-14` -eq $TOMCAT_PID ]; do
    echo IT IS ALIVE!
    sleep 1
done
echo -ne "PID results changed, dude!\n"

I always wind up getting kicked out of the loop b/c ps returned more than one value.

Any suggestions of things I can try to get the right value 100% of the time?

Thanks,

Dave
 

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LEARN ABOUT OSX

kill.d

kill.d(1m)							   USER COMMANDS							kill.d(1m)

NAME

       kill.d - snoop process signals as they occur. Uses DTrace.

SYNOPSIS

       kill.d

DESCRIPTION

       kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
       ber and result.

       This program can be used to determine which process is sending signals to which other process.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Default output, print process signals as they are sent.
	      # kill.d

FIELDS

       FROM   source PID

       COMMAND
	      source command name

       TO     destination PID

       SIG    destination signal ("9" for a kill -9)

       RESULT result of signal (-1 is for failure)

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       kill.d will run forever until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M), truss(1)

version 0.90							   May 14, 2005 							kill.d(1m)
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