Answer Posted / abhay

WE CAN SOLVE THIS PROBLEM THROUGH 2 METHODS..
1) THROUGH JCL:
By using ICEMAN utility, it cab be done as below:
//S1 EXEC PGM=ICEMAN
//DD1 DD DSN=.....
//DD2 DD DSN=....
.
.
//SYSIN DD *
SELECT FROM INDD(DD1) TO OUTDD(DD2) ON (1, 4 CH, A) ALLDUPS
SELECT FROM INDD(DD1) TO OUTDD(DD2) ON (1, 4 CH, A) NONDUPS
*/
//
2) THROUGH COBOL PROGRAM:
AS BELOW

1)FIRST SORT 2 FILES ON ANY KEY
2)READ 2 FILES FOR MATCHING KEYS.IF KEY OF 2 FILES MATCHED,
THEN PUT RECORDS INTO FILE3 ELSE MOVE IT INTO FILE4
3)REPEAT THE PROCESS UNTIL END-OF-FILE1 AND END-OF-FILE2.

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