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Subject: Re: [TUHS] PDP-7 UNIX filesystem
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MVS(Z/OS).DD statement means Data definition,
//DD-name DD Parameters
whereas DD-NAME identifies the dataset (=file). The real file is referenced by this name within the program. Say DD hello then the program source says: open hello; read hello, and so on.

Thus MVS(Z/OS).DD  having nothing todo withUNIX.DD.