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 each of the following important directories?

      the root directory for the system _________
      
      the current directory you are working in ___________
      
      the directory one level up in the tree from the one you are currently in _________
      
      your home directory _________
      
      

   2. Give the command to do each of the following (the complete command):
      
      Change into the root directory _____________________
      
      Show the pathname of your current working directory __________________
      
      Change to the directory one level up in the tree from the one you are currently in ________________________________
      
      Go to your home directory ___________________

2. The root directory in a Unix system contains a subdirectory named bin. What does the bin directory contain?

    

    

3. Modern operating systems come with windowing systems and desktop management programs to make using the computer easier but most programmers who use UNIX operating systems (such as Linux) spend much of their time working in the shell. What is a shell?

    

    

4. Suppose you are in the LABS subdirectory of the file structure chart handed out in class (a separate sheet with blanks to fill in). What sequence of shell commands would you type to do the following:
   1. get into ingram's Simulation directory _________________________________

   2. then see a list of the files there _____________________________
      
      
   3. then create a subdirectory name Projects _______________________________

5. Suppose the permissions on a file are -rw-rw----.
   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)?

        

       

6. Suppose you are currently in bozo's home directory of the file structure chart handed out in class.
   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. There are two problems with this command. What are the two problems?

       

       

      Write the correct command to copy the file.

       

       

   
   

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?