Describing the input to sorting or merging

Describe the input file or files for sorting or merging by following the procedure below.

1. Write one or more SELECT clauses in the FILE-CONTROL paragraph of the ENVIRONMENT DIVISION to name the input files. For example:

   
   ENVIRONMENT DIVISION.
   INPUT-OUTPUT SECTION.
   FILE-CONTROL.
       SELECT Input-File ASSIGN TO InFile.
   

   Input-File is the name of the file in your program. Use this name to refer to the file.

2. Describe the input file (or files when merging) in an FD entry in the FILE SECTION of the DATA DIVISION. For example:

   
   DATA DIVISION.
   FILE SECTION.
   FD  Input-File 
       LABEL RECORDS ARE STANDARD
       BLOCK CONTAINS 0 CHARACTERS 
       RECORDING MODE IS F 
       RECORD CONTAINS 100 CHARACTERS.
   01  Input-Record   PIC X(100).