Pre-Lab Assignment: Lab #1

  1. When first working in Linux students often have trouble distinguishing between commands (such as cd) that perform operations in the file system and the files themselves (the names (or symbols) for the files).
    1. In a UNIX file system, what symbol represents the root directory? _______

    2. What command do you use to change to the root directory? __________________

    3. What symbol represents the current directory you are working in? _______

    4. What symbol indicates a home directory? (Used alone it represents your home directory; concatenated with a username represents that user's home directory.) __________

    5. What command would you use to copy a file named MoreQuestions from the home directory of cpsc to your current working directory?

      _______________________________________________________________

    6. What symbol(s) represent the directory one level up in the tree from the one you are currently in? _________

    7. What command would you use to change to the directory one level up in the tree from the one you are currently in?

      _________________________________________________________

  2. The computers in the Trexler lab are dual boot. What does that mean?

     

     

     

  3. In the handouts describing Linux (including the lab) there are three different names given to the window we type Linux shell commands into. List these 3 names.

     

     

  4. Suppose you are in the LABS subdirectory of the file structure chart shown above. What sequence of shell commands would you type to do the following:

    1. get into hughes' CPSC101 directory _________________________________

    2. then see a list of the files there _____________________________

    3. then create a subdirectory name Projects _______________________________

  5. Suppose you are currently in bozo's home directory of the file structure chart shown above.

    1. What is the relative pathname of the file Fun.java?

       

       

    2. Suppose you are still in bozo's home and you want to copy the file Fun.java into bozo's games subdirectory. Suppose you type in the command

      cp Fun.java

      You will get an error message. What are two distinct problems with this command.

       

       

      Write the correct command(s) to copy the file.

       

       

  6. Suppose the permissions on a file are -rw-rw-r--.
    1. Can someone other than the owner look at this file? Explain.

       

       

    2. Can someone other than the owner make modifications to this file? Explain.

       

       

    3. What shell command do you use to get a list of the files in your current directory that also shows the permissions on the files (and other information such as when the files were created)?

        

       


  7. Suppose your task is to write a Java program that will print out the following message (including the row of equal marks): 
                                          
        Computer Science, Yes!!!!
        =========================
    The following is an outline of the program. Complete it as follows:
    1. In the documentation at the top, fill in the name of the file the program would be saved in and your name as the author.
    2. Add the code for the main method to do the printing. 
    
// *******************************************************************
// File Name:  ___________________________________________________
//
// Author: _________________________________________
// *******************************************************************

public class CSYes
{
   // -------------------------------------------------
   //  The following main method prints an exciting
   //  message about computer science
   // -------------------------------------------------












}
  8. What is Java bytecode?

     

     

     

  9. What is white space and how does it affect the readability of a program?