z/OS UNIX services issues system completion codes: abend codes EC6 and 422.

All 422 abends and some EC6 abends might not be accompanied by an SVC dump, because the IBM-supplied IEASLP00 parmlib member contains SLIP commands to suppress the dumps.

Some abends are a normal result of a kill shell command, an exec shell command or program function, or the ending of a process. Others are caused by errors.