Task 3.4 Challenge Exercises (15 Points) a. Write Script to see current date, time, username, and current directory. b.Take the script from Task 2.5 and write it so it does not create a file if no input is received. c. In this exercise, you will create a script based on case statement. d. Write a Shell using for loop to print three strings e. Write a bash Script to reverse a given positive integer