command choice exit programs -- MIDRANGE-L

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Does anyone have a simple command choice exit program that they wouldn't
mind sharing (send privately)? (command PARM CHOICE(*PGM)
CHOICEPGM(program)) The CL manual doesn't have a sample program. What I
want to do is prompt for a list of members in a file. Where I'm confused
is that:
1) The first parameter has a C or P in position 21. What controls this?
I'd assume that I want to return a list, so I would use the 2000-length
field.
2) In CL, how do I get a parameter that might be two different lengths?

Thank you,
Loyd Goodbar

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