Answer Posted / nnn

First sort the both files through JCL or internal sort.
Then follow below logic in the program.

Read file1
Read file2

perform until end-of file1 OR end-of file2
if file1 = file2
write a matched record to output
read file1
read file2
end-if
if file1 < file2
read file1
end-if
if file1 > file2
read file2
end-if
End-perform.

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