Answer / nsingh

SORT FIELDS=COPY
OUTREC FIELDS=(1,80,SEQNUM,ZD,4)

It will add sequence number at position 81 of 4 bytes in
ascending order.
Now Sort the sequence number in descending order to reverse
the sequence and then remove sequence number from file.

SORT FIELDS=(81,4,ZD,D)
OUTREC FIELDS=(1,80)

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