UNIX Systems Programming Write a shell script that will act as a supermarket shopping data entry screen. The screen will look like below : Item Name : Item Cost : Number of Items Purchased : a. Use the “read” shell command to get the user input for each field. Store each field in a separate variable. b. Write all the data fields to a file using the “echo” command, a sample of which is shown below. Ask user if there is any more items to enter with a y/n answer, if n quit... . Finally, a file that would be created might look like : eggs 1.25 6 milk 2.05 1 cereal 4.45 3 bagel 0.65 12 creamcheese 1.50 4

Create a file called contacts.py, implement a program that prompts the user to select a choice between these 5 options. Add contact (1), Delete Contact (2) Save Contact(3), show all contact (4), exit program (5). Contact info should be saved in a separate read/write file. If user inputs number (1) on the keyboard, then prompt them to input the name and number of the contact. If user selects (2), delete all contacts or show an error if there are no contacts saved to file. If user inputs (3) save the contact and loop the choice of the 5 options until user inputs (5) to exit. If user inputs (4) print out the saved contacts to the screen neatly, Name, Number(newline). if user inputs 5 then exit the program. If the user inputs a number not shown then give an error message and ask them to input a valid number.  Please code in python, preferably using case statements to complete

Given a text file food.txt containing the availability of food items. Write a program that reads the information from the text file and outputs the available food items. Add comments to better understand it txt.file content ========== Sandwiches Ham sandwich Classic ham sandwich Available Sandwiches Chicken salad sandwich Chicken salad sandwich Available Sandwiches Cheeseburger Classic cheeseburger Not available Salads Asian salad Mixed greens with ginger dressing, sprinkled with sesame Not available Beverages Water 16oz bottled water Available Vegetarian Avocado sandwich Sliced avocado with fruity spread Not available Mexican food Beef tacos Ground beef in freshly made tortillas Available Mexican food Chicken tacos Grilled chicken breast in freshly made tortillas Not available Beverages Coca-Cola 16oz Coca-Cola Available

Write a program that reads student's IDs and exam scores (type int) for a particular exam in a course from each line of an input file (the input file is included). You need to compute the average of these scores and assign grades to each student according to the following regulation: If a student's score is within 10 points (above or below) of the average, assign a grade of satisfactory. If a student's score is more than 10 points above average, the grade will be outstanding. If a student's score is more than 10 points below the average, the grade will be unsatisfactory. The output of your program should consist of a three-column table that shows each ID, score, and corresponding grade. A sample output is shown below. ID SOLS SENTO 0 1 2 3 4 8 9 Score 75 99 66 43 87 65 82 91 84 76 Grade Satisfactory Outstanding Unsatisfactory Unsatisfactory Outstanding Unsatisfactory Satisfactory Outstanding Satisfactory Satisfactory Write necessary functions and put them in a module to process this…