JOBCAT and STEPCAT define VSAM catalogs to be used for VSAM clusters. In the CA EPIC for z/VSE DD facility (but not in MVS), they also define catalogs to be used for VSAM/SAM datasets.
JOBCAT defines the catalog for the entire job stream. STEPCAT defines the catalog for a step. STEPCAT overrides a JOBCAT definition for that step.
A JOBCAT DD must immediately follow the JOB statement. A STEPCAT DD must precede all VSAM labels which require that catalog.
Example
//JOB VSAM UPDATE * //JOBCAT DD DSN=VSAM.JOB.CATALOG,DISP=SHR . * //STEPCAT DD DSN=VSAM.STEP.CATALOG,DISP=SHR vsam labels // EXEC PROGRAM /&
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