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The PID file for this statement is created but it is always empty. When running the shell with -x I see that $! empty, yet at the end the java job is left running in the background as desired. Why is the pid missing?

 su - $USER -c "nohup java $rest_api_opts -jar $app_home/$app_name \ > /dev/null 2>&1& echo $! > $PID"
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1 Answer 1

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2

Fixed. The trouble is that $! is expanded too early. So escaping it delayed the expansion

su - $USER -c "nohup java $rest_api_opts -jar $app_home/$app_name \ > /dev/null 2>&1& echo \$! > $PID"
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