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Command is executed twice

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# 1  
Old 04-15-2013
Command is executed twice
Hi

I try to run a command using bash script. The script should now look like this:
Code:
#!/bin/bash
case "$1" in

        start)
                sudo su - cispmgm -c "/usr/local/jdk/bin/java -Dworking.dir=/opt/ibm/cisp -Denvironment.target= -Xms512M -Xmx1024M -classpath /opt/ibm/cisp/:/opt/ibm/cisp/conf:/opt/ibm/cisp/lib/AIB-CispClient-1.2.0-SNAPSHOT.jar ch.coop.aib.v1.job.Run -d /opt/ibm/cisp --start">/opt/ibm/cisp/log/console.log 2>&1 &
        ;;
        stop)
        ;;

        restart)
                $0 stop
                sleep 30
                $0 start
                ;;

        *)

        echo "usage: $0 (start|stop|restart)"

esac

If I start the script as a normal user with the following command: ./startcisp.sh start

If the command is executed twice in the script:

Code:
cispmgm   7404     1  0 10:43 pts/3    00:00:00 su - cispmgm -c /usr/local/jdk/bin/java -Dworking.dir=/opt/ibm/cisp -Denvironment.target= -Xms512M -Xmx1024M -classpath /opt/ibm/cisp/:/opt/ibm/cisp/conf:/opt/ibm/cisp/lib/AIB-CispClient-1.2.0-SNAPSHOT.jar ch.coop.aib.v1.job.Run -d /opt/ibm/cisp --start
cispmgm   7405  7404 11 10:43 ?        00:00:02 /usr/local/jdk/bin/java -Dworking.dir=/opt/ibm/cisp -Denvironment.target= -Xms512M -Xmx1024M -classpath /opt/ibm/cisp/:/opt/ibm/cisp/conf:/opt/ibm/cisp/lib/AIB-CispClient-1.2.0-SNAPSHOT.jar ch.coop.aib.v1.job.Run -d /opt/ibm/cisp --start

if I kille Task 7405 (the second), the first task is terminated automatically. If I but the task kille 7404, continues the second and the program also runs correctly.

What can I do so I do not get two tasks?
My system is a Linux.

Thanks for the help and greetings
Nico
Last edited by DukeNuke2; 04-15-2013 at 06:11 AM..
# 2  
Old 04-15-2013
Please note that PID: 7405 is the child process of PID: 7404

When you kill PID: 7405 (child process), PID: 7404 (parent process) dies automatically because it was just waiting to collect the exit status of its child.

But if you kill the PID: 7405 (parent process), PID: 7405 (child process) becomes a "zombie" and kernel re-parents it to PID: 1 (init process).

So the conclusion is they are not literally separate tasks. They are supposed to be running that way.
# 3  
Old 04-15-2013
Quote:
Originally Posted by Yoda
But if you kill the PID: 7405 (parent process), PID: 7405 (child process) becomes a "zombie" and kernel re-parents it to PID: 1 (init process).
That's an orphan, not a zombie.

A process becomes a zombie when it exits/dies and its parent is alive but not waiting on it. The system is forced to keep a process table entry for that child, in case the parent at some point decides that it cares about the exit status.

When a negligent parent exits (or a dutiful parent is killed), init adopts its children and waits on them. If some of the children had become zombies, they can now finally rest in peace as the kernel reaps them from the process table.

Regards,
Alister

P.S. BRAAAIIIIIIIINS!!! Smilie
Last edited by alister; 04-15-2013 at 02:11 PM..
This User Gave Thanks to alister For This Post:
Yoda
# 4  
Old 04-15-2013
Quote:
Originally Posted by alister
P.S. BRAAAIIIIIIIINS!!! Smilie
Oops.. I regret calling a poor orphan a zombie.

I should have thought it when I noticed that OP killed it successfully. But usually kill command has no effect on a zombie process.
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