JCL - Nested Procedure

Cataloged and in-stream procedures can invoke other procedures (up to 15 levels of nesting). In a procedure, an EXEC statement can invoke another procedure, which can contain an EXEC statement to invoke another procedure, and so on.

We cannot code an instream procedure within a cataloged procedure.

The following example shows how procedures can be nested:

Procedure C:
    //C       PROC
    //CS1     EXEC  PGM=GHI
               .
    //        PEND

 Procedure B:
    //B       PROC
    //BS1     EXEC  PROC=C
               .
    //BS2     EXEC  PGM=DEF
               .
    //        PEND

 Procedure A:
    //A       PROC
    //AS1     EXEC  PROC=B
               .
    //AS2     EXEC  PGM=ABC
               .
    //        PEND

 Job Stream:
    //JOB1    JOB
    //STEP1   EXEC  PROC=A
               .
    //STEP2   EXEC  PGM=JKL
               .
               .

The following statements are equivalent to the nested procedures shown above.

//JOB1    JOB
   //CS1     EXEC  PGM=GHI
              .
   //BS2     EXEC  PGM=DEF
              .
   //AS2     EXEC  PGM=ABC
              .
   //STEP2   EXEC  PGM=JKL
              .
              .

We don't use nested procedure often in real time projects. We mostly use cateloged procedure.

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