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I just saw the concern over updating a record. For that, the file has to be marked for update, the record has to be read, and then lines added to the output spec. Below is an example. I am sure there is an error in assigning the right-side indicators, but you can see where this is going. This would be a place where you would use MR indicators to control the order of the READs and to determine if there is an existing record to update; otherwise, add a record. But matching record usage is not part of your question. (Please understand, it has been 20+ years since I actually did this.):

FS36INP IP F 55 DISK
FS36OUT US F 55 DISK A

E ARRY 1 3 8
IS36INP 01
I 1 55 RCDINP
IS36OUT 02

C 01 MOVE ARRY,2 ARRY,3
C 02 SETON 71

OS36OUT D 02
O RCDINP 55
O ARRY,3 25
O DADD N71
O RCDINP 55
O ARRY,3 25


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