Within the environment division, and within the input-output section,
and within the file-control paragraph, our example describes the
two unix data files we will use, called payroll.in and payroll.out.

These two files will be called, from within our COBOL program,
employee-file-in and employee-file-out, respectively.

environment division.
input-output section.
file-control.
        select employee-file-in
                assign to input "payroll.in".
        select employee-file-out
                assign to output "payroll.out".