in linux bash Examine the file students.txt that you downloaded at the start of the lab. Each row of this file contains a students first name, last name, major, and 5 test scores. Write a script that uses a while read statement to input all of the data, line by line, compute the average test score and then assign a letter grade (see the logic on page 15 of the text). The 5th test is worth double (you should divide by 6 instead of 5 since test 5 is worth twice as much). Output for each student, the students last name, major and letter grade. Additionally, sum up the number of students who passed (got at least a D or higher) and the number of students who failed. When you run your script, remember to redirect input from students.txt.