I've always considered DD's one of the major differences between MVS and other platforms. I remember one of my first BASIC programs in college where we had to code something like "OPEN PAYROLL.DATA FOR INPUT AS #1" and sort. The first thing I thought of was, "So we have to update the program every time we want to sort a different file?"

DD redirection:  Genius, whoever thought of it.

On 7/11/2018 8:40 AM, Steve Smith wrote:

DDNAMEs are a pretty nice feature of z/OS!  So you *don't* have to pass a
bunch of (potentially very long) file names.  DDNAMEs can be thought of as
a limited form of environment variables.

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