5 A data file file has some student records including rollno, names and subject marks. The fields are separated by a :. Write a shell script that accepts roll number from the user, searches it in the file and if the roll number is present - allows the user to modify name and marks in 3 subjects. If the roll number is not present, display a message Roll No Not Found. Allow the user to modify one record at a time.

need in UNIX based shell script