Notice also that:
1) I asked what was meant by "reverse" (reverse of WHAT? Key? RRN?) and
the poster did not clarify, but merely restated the same question.
2) I asked for a definition of the file to read in reverse, and the
poster did not reply.
It sure makes me wonder about this OP!
FWIW -- I wrote myself a little CL program that does indeed read a file
in reverse RRN sequence. It works on any PF, and runs very fast. Not
sure I want to post it here, though -- I'd say the best answers have
already been given: "Do it in RPG."
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