25. Using the given file "marks.csv" (delimited by %), print the column "student_names" without the header (you can use the column num as index). Use the cut command for this. 26. Using the given file "marks.csv", print the sorted list of marks in "subject _3". Use the sort command piped with the cut command. 27. Using the given file "marks.csv", print the average marks for "subject_2". 28. Save the average into a new file "done.txt". 29. Move "done.txt" into your "final" directory. 30. Rename the "done.txt" file to "average.txt".