Can this script wait for an external process to complete?

I have written this shell script as wrapper to a JAR file. The script launches the JAR without problem but completes without waiting for the JAR to finish its job.

#!/bin/bash

export WORK=/opt/conversion
export LOG=$WORK
export XMAIL=me@email.com
export JAVA_BASE=/usr/java/jdk1.6.0_06
export JAVA_HOME=/usr/java/jdk1.6.0_06/bin
export JAR=$WORK/conversion.jar
export CLASSPATH=$JAVA_BASE/lib/tools.jar
export CLASSPATH=$CLASSPATH:$WORK/lib/ojdbc14.jar
export CLASSPATH=$CLASSPATH:$JAR

$JAVA_HOME/java -Xms256M -Xmx512M -classpath 开发者_如何学Python$CLASSPATH com.myapp.cam.conversion >>$WORK/job.out 2>&1 &

echo $! > $WORK/job.pid
mail -s "Conversion" $XMAIL < $WORK/user_message
exit 0

Is there a way to have the script wait on my JAR file to complete?

Thanks for your input.

---

As others have said, remove the & and bash will wait till the command finishes. If you insist on running your process in the background, here is what you could do:

pid=`pidof java`

if [ "$pid" ]; then
    while kill -0 "$pid"; do
        sleep 1
    done
fi

The kill command is normally used to send signals to a particular process, but by using 0 as a signal you are only checking whether a process with such a pid exists without sending a signal.

---

You have a & at the end of the command:

$JAVA_HOME/java -Xms256M -Xmx512M -classpath $CLASSPATH com.myapp.cam.conversion >>$WORK/job.out 2>&1 &

which makes it run in background.

Remove the & to wait for the java process to complete before you proceed in the script.

---

If you want to run it in the background, add a wait command at the end of the script.

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Don't run the conversion Java application in the background. Or, run ps repeatedly until you don't see the pid. This will allow you to do stuff while waiting.