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A job consists of one or more steps. Each step consists of one or more programs or tasks. As each job step ends, it returns a completion code to the operating system through the return macro for a normal end or the abend macro (SVC 13) for an abnormal end. An abend is the termination of a task before it is finished due to an error condition that cannot be resolved by recovery facilities while the task is executing. There are two kinds of abends: program‑generated or z/OS‑generated.
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