You may want to use BPXWDY2. It dow not require the setting of R0. And it does almost everything that BPXWDYN does.

Steve Thompson.

PS. Speaking of RCFS, this is one I did an RCF about and I understand there are some updates being done to/with the DOC for examples.



On 4/28/2023 3:52 PM, Paul Gilmartin wrote:
On Fri, 28 Apr 2023 19:37:39 +0000, Schmitt, Michael wrote:

I know how to have a COBOL program on z/OS use a data set name that isn't 
determined until runtime, via an environment variable. My question is can you 
use one file (i.e. one select/assign and one FD) to write to different DD 
names, that were already allocated in the JCL?

I can't find a way, and in the manual the syntax for the environment variable 
method requires a DSN or PATH, no option for a DD name.

Do you know the DSN or PATH?

Do you want to specify the DD name or let Dynalloc choose one?

Do BPXWDYN keys RTDDN and INFO help you?  BPXWDYN can be called with OS 
standard linkage.
<https://www.ibm.com/docs/en/zos/2.5.0?topic=services-bpxwdyn-text-interface-dynamic-allocation-dynamic-output>


--
Regards,
Steve Thompson
VS Strategies LLC
Westfield IN
972-983-9430 cell

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