¿Cómo ejecutar un Shell Script desde PLSQL? (DBMS_SCHEDULER)

BEGIN
  -- Create a Job
  DBMS_SCHEDULER.create_job
  (job_name          =>'TEST_SHELL_SCRIPT_JOB',
   job_action         =>'/var/tmp/TEMP/TESTSHELL.sh',
   job_type           =>'EXECUTABLE',
   number_of_arguments=>1,
   enabled            =>FALSE,
   auto_drop          => TRUE
  );

  -- define the arguments and their values for each argument (in this case there is only one)
  DBMS_SCHEDULER.set_job_argument_value
     (job_name          =>'TEST_SHELL_SCRIPT_JOB',
      argument_position => 1,
      argument_value    => 'SHAREORACLEAPPS'
      );

  -- Since we couldn't enable it when creating it with arguments, enable it now
  DBMS_SCHEDULER.enable('TEST_SHELL_SCRIPT_JOB');

  -- since we want this Job to execute now, we call run_job
  DBMS_SCHEDULER.run_job (job_name=> 'TEST_SHELL_SCRIPT_JOB');

  -- if we get here without an error, the job has completed so we can drop it
  DBMS_SCHEDULER.drop_job (job_name=> 'TEST_SHELL_SCRIPT_JOB');

EXCEPTION
  WHEN OTHERS THEN
    DBMS_OUTPUT.PUT_LINE(SQLCODE||SQLERRM);
END;