With string filename assignemnt

input.txt

11111NAME SURNAMEXXXXXXXXXXXXX
11112NAME SURNAMEXXXXXXXXXXXXX

runner.sh

#!/bin/sh

cobc -x sample.cob -o sample
export DD_STUDENTFILE=input.txt
./sample

sample.cob

       IDENTIFICATION DIVISION.
       PROGRAM-ID. HELLO.

       ENVIRONMENT DIVISION.
          INPUT-OUTPUT SECTION.
             FILE-CONTROL.
             SELECT STUDENT ASSIGN TO "STUDENTFILE"
             ORGANIZATION IS LINE SEQUENTIAL.

       DATA DIVISION.
          FILE SECTION.
          FD STUDENT.
          01 STUDENT-FILE.
             05 STUDENT-ID PIC 9(5).
             05 NAME PIC A(25).

          WORKING-STORAGE SECTION.
          01 WS-STUDENT.
             05 WS-STUDENT-ID PIC 9(5).
             05 WS-NAME PIC A(25).
          01 WS-EOF PIC A(1).

       PROCEDURE DIVISION.
          OPEN INPUT STUDENT.
             PERFORM UNTIL WS-EOF='Y'
             READ STUDENT INTO WS-STUDENT
                AT END MOVE 'Y' TO WS-EOF
                NOT AT END DISPLAY WS-STUDENT
             END-READ
             END-PERFORM.
          CLOSE STUDENT.
       STOP RUN.