Overriding SIGQUIT
Diagnostic commands can also be invoked by overriding the default behavior of the SIGQUIT process signal. Recollect from Chapter 4 that the default behavior of a JVM receiving a SIGQUIT is to write a thread dump containing the current state of all the threads to the console. One way of sending a SIGQUIT signal to the JVM process is to press Ctrl + Break (Windows), or Ctrl + \ (Linux), in the shell where the Java process was started. On *NIX-systems, executing kill -3 <PID> or kill -QUIT <PID> from a shell is an alternative way of issuing a SIGQUIT to a process with a given ID.
To override the SIGQUIT behavior of JRockit with a custom command sequence; put the list of commands to be executed in a plain text file and name it
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