What does RC 0 vs RC 4 vs RC 8 mean on a job?

Job "worked" but SDSF shows RC=04 on a step. Someone said 0 is good, 4 is warning, 8 is bad. Is that always true?

Rough rule, not a law.

0 = usually fine. 4 = often warning (SORT found nothing to do, compiler warnings, etc). 8+ = something failed for that utility.

Always read the step SYSOUT. A 4 from one tool can be normal and a 4 from another can mean you are about to hurt yourself.

Also COND and IF RC logic in the JCL decide whether later steps run. RC is how steps talk to each other.