z/OS MVS JCL Reference
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Data set name for dummy data set

z/OS MVS JCL Reference

Specifies a dummy data set. NULLFILE has the same effect as coding the DD DUMMY parameter. NULLFILE must be coded as a single-word parameter. For instance, IBM does not support the use of NULLFILE to obtain a dummy data set for these (or other) formats:
  • When followed by a member name
  • As a qualifier in a qualified data set name
  • As a temporary data set name.

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