CS 497C - Programming Assignment 2 - Name:_____________________________
                                                                        
    DUE: Wednesday, December 5 (in class)

    o Please show all work on a separate sheet attached to this sheet
      when you turn it in. 

    o For each exercise, submit a listing of your source code along
      with scripted output showing that the code executes correctly.
      To generate scripted output on the UNIX system, use the "script"
      command.

    o Put your name in each script and add some necessary comments. These 
      are a part of grading in this assignment.

    o Both the hard copy and the electronic copy should be submitted.

    o For each exercise, submit a runnable script and scripted output. The 
      names of the script should be ex1, ex2, and ex3 respectively and the 
      scripted output is ex.out.

    o Use the handin system to submit all code electronically. The 
      submission ID is 2:
      ~cs497c/bin/handin 2 ex1 ex2 ex3 ex.out

    o Thanks! (110 points)


    1. Write a script to back up multiple files into a directory, create 
       the directory if the directory doesn't exist, and display the message 
       indicating the number of files has been successfully backed up. The 
       last argument to the script is the directory.
       (hint: Modify cpback2.sh on the page 573) (30 points)

       $ ls
       foo1  foo2  foo3  foo4  foo5  foo6
       $ ex1 * progs
       The directory progs is created.
       6 files have been backed up into the directory progs.
       $ ls
       foo1  foo2  foo3  foo4  foo5  foo6  progs
       $ ls progs
       foo1  foo2  foo3  foo4  foo5  foo6
       

    2. Write a command menu as follows:
     
       $ ex2

          Command Menu

       a. Enter a welcome message and write this message to a file msg.
       b. Send the contents of the file msg to all users who are logged in. 
       c. Display the process status in the system five times every 10 seconds.

       Enter a, b, or c:

       The function for each selection is as indicated in the menu.
       (hint: b. Use the mail command. For example, mail username < msg.)
       (40 points)


    3. Write a script to read in at least ten scores, sorts them, prints them 
       out in an descending order, and calculate their sum and average. 
       (hint: Use arrarys.) (40 points)

       $ ex3 
       Input 10 scores: 89 53 62 90 88 74 77 86 95 91 
       Ordered scores: 95 91 90 89 88 86 77 74 62 53
       The sum of all the scores is 805.
       The average is 80.5.