program #3  OSpgm3d_4Fall2025   

CGS3767 Operating Systems for IT
Professor: Michael Robinson 
e-mail   : michael.robinson@cs.fiu.edu 
Web Page : cs.fiu.edu/~mrobi002

This assignment is worth 10 points total, partial credit will be given. 

   ***************************************************************************
   * USE UBUNTU TERMINAL MODE COMMANDS ONLY, LEARNED IN THIS CLASS *
   * USE ANY EDITOR TO CREATE THIS PROGRAM                                   * 
   ***************************************************************************


-0.50 1 - Worth 0.50 points. 
        - Using Linux shell commands, create a shell file named:
          yourLastNameFirstNameInitialUbuntuOSpgm3.sh
        - Using any Ubuntu editor, append the following documentation
          USING MULTI-LINE COMMENTS:

        **************************************************************
        Author    : Your Name 
        Course    : OS section. Example OS1, OS2 OS3, OS4
        Professor : Michael Robinson 
        Program # : Number and  program Purpose/Description 
                 { A brief description of the program }
                
        Due Date  : MM/DD/YYYY 
                 
        Certification: 
        I hereby certify that this work is my own and none of it,
        is the work of any other person. 
             
        **************************************************************


      2) Using Linux Shell Scripting. 
         - Creating and using the variables FirstNumber and SecondNumber,
         Implement division by 0, with error trapping, using if and while commands,
       
      How:
-0.50 a) using ANY Linux editor, append to your .sh file commands that will do the    
         following:

-1.00 b) Append your name and CURRENT running date and time to a NEW file called 
         results.txt
         "CURRENT running date" means, when the program is executed the CURRENT 
         running time will be appended to your results.txt file

-0.50 c) Using the variables: FirstNumber and SecondNumber, use a while loop.

-0.50 d) Ask the user to enter the FirstNumber.

-0.50 e) If the user enters the value 33 for this FirstNumber, you 
         must exit THIS Linux Shell Scripting SECTION immediately.

-0.50 f) Ask the user to enter the SecondNumber.

-0.50 g) If the user enters the value 66 for this SecondNumber, you 
         must exit THIS Linux Shell Scripting SECTION immediately.

-1.50 h) If the SecondNumber is ZERO inform the user that you CAN NOT divide by 
         ZERO, and ask for a correct SecondNumber only, KEEPING YOUR FirstNumber.
       
-1.00 i) If the SecondNumber is NOT a zero, divide FirstNumber by SecondNumber then
         display all numbers on this computation using labels, and 
         append all numbers on this computation using labels to the results.txt file.
    
         example: 4 divided by 1 = 4
  

      3) - Linux Shell Scripting.
-1.00 a) MANUALLY download to YOUR computer the file, in the same folder where
         your program in the following question b is located:
         http://users.cis.fiu.edu/~mrobi002/downloads/HumanGenome/VenterGraig/VGuncompressed/hs_alt_HuRef_chr10.fa     

         Using editors, append to your *.sh file, all the commands needed so that 
         when you execute your sh file, this file will produce the following:

-2.00 b) Using the file in question 3a, find out and display the total amount of
         ACGT substrings found in the first 1,500 lines in the file in question 3a

--------
10.00 total points

Upload this Linux program to canvas.fiu.edu on the due date.