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Running two command at the same time

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# 8  
Old 11-26-2007
The background job will continue to run.

I didn't script an error path, since that's a whole other conversation entirely. But as a rule, the background job should be killed.

echo "Terminating job '$PID'."
kill $PID && sleep 1
ps $PID && kill -9 $PID && sleep 1
ps $PID 2>&1 && echo "Job did not die!" || echo "Job terminated."

Of course, the error path from the loop should also clean up any temp files, stop any other background processes, log some diagnostic info, terminate the script, etc.
# 9  
Old 11-26-2007
Ideally you would create a trap that would kill the background job(s) if the script exited or was killed. But that is a separate issue.

On the Unixes I use, "ps $PID" will return non-zero when $PID is not in the process table. It may be that your Unix does not, in which case you must use some form of "ps $PID | grep" to determine if the background process has completed.
# 10  
Old 11-27-2007
It works well now. Thanks for everyone who help me! Smilie
# 11  
Old 11-27-2007
Originally Posted by gus2000
On the Unixes I use, "ps $PID" will return non-zero when $PID is not in the process table. It may be that your Unix does not, in which case you must use some form of "ps $PID | grep" to determine if the background process has completed.

while kill -0 $PID 2> /dev/null
  echo $PID still alive


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