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Task/File-input-output/COBOL/file-input-output-1.cobol

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+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. file-io.
+
+       ENVIRONMENT DIVISION.
+       INPUT-OUTPUT SECTION.
+       FILE-CONTROL.
+           SELECT in-file ASSIGN "input.txt"
+               ORGANIZATION LINE SEQUENTIAL.
+
+           SELECT OPTIONAL out-file ASSIGN "output.txt"
+               ORGANIZATION LINE SEQUENTIAL.
+
+       DATA DIVISION.
+       FILE SECTION.
+       FD  in-file.
+       01  in-line                 PIC X(256).
+
+       FD  out-file.
+       01  out-line                PIC X(256).
+
+       PROCEDURE DIVISION.
+       DECLARATIVES.
+       in-file-error SECTION.
+           USE AFTER ERROR ON in-file.
+           DISPLAY "An error occurred while using input.txt."
+           GOBACK
+           .
+       out-file-error SECTION.
+           USE AFTER ERROR ON out-file.
+           DISPLAY "An error occurred while using output.txt."
+           GOBACK
+           .
+       END DECLARATIVES.
+
+       mainline.
+           OPEN INPUT in-file
+           OPEN OUTPUT out-file
+
+           PERFORM FOREVER
+               READ in-file
+                   AT END
+                       EXIT PERFORM
+               END-READ
+               WRITE out-line FROM in-line
+           END-PERFORM
+
+           CLOSE in-file, out-file
+           .

Task/File-input-output/COBOL/file-input-output-2.cobol

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+*> Originally from ACUCOBOL-GT
+CALL "C$COPY" USING "input.txt", "output.txt", 0

Task/File-input-output/COBOL/file-input-output-3.cobol

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+*> Originally from Micro Focus COBOL
+CALL "CBL_COPY_FILE" USING "input.txt", "output.txt"