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Use the external indicator keyword on your F-spec. Use an external indicator, U1 - U8, and make sure it's off when the program runs. If you ever want to run it interactively just turn on the switch prior to the call. Used in this context the external switch tells the program to only open the file if the switch is turned on. If the switch is off the file is not opened and any file operations are ignored during processing. No other code changes are necessary.
In RPGIV syntax, you can just use the keyword USROPN on the F-spec.I have written a batch program that allocated a terminal while running in batch. It was some short program, a long long time ago, but it worked. The gotcha I think was that the display file has to be something like either reserved for the same subsystem as the corresponding batch job, or, it had to be "up for grabs" by the subsystem, something like that. Which also means that it won't have the sign-on screen.
On the other hand, I made a change in one interactive program to run in batch programs, and to get it done quickly, just put the USROPN keyword on the display file, and then skipped over all the EXFMT and WRITE and READ opcodes. That includes the subfile processing, by the way, which may complicate things for quick adaptation.
However, by all means, if at all minimally possible, follow the general admonitions here and yank out the display file processing for this one.
-- Alan
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