Introduction to Unix
Homework 3


1. 
    In preparation for the following steps, create two (2) text files in
    your home directory on your Unix system named 1st and 2nd, by using the
    cat command example shown on page 55 of the textbook. You may type
    whatever text you want into these files, as long as it consists of
    printable characters that can be viewed on the Unix command line. Also,
    after executing the following steps for each figure, if you delete files
    1st and 2nd by mistake, then recreate them before you go on to the next
    figure.  

    Using the figures found on the homework 3 web page, and the file
    maintenance commands covered in Chapter 3 of the textbook, create a
    directory and file structure under your home directory on your Unix
    system exactly as shown in each figure. A directory is represented in
    the figures as a rectangle, and a file is represented as a circle. Copy
    and paste the session showing the commands you used in sequence to
    create the structure for each figure. The directories and files that
    already exist in your home directory before you begin are irrelevant for
    our purposes in these exercises. In the event that directories that
    already exist in your home directory before you start any exercise have
    the same exact names as any of those shown in the figures below, then
    simply make up your own names for what is shown in the figures, and
    create the structure using your own names. Hint: You can always use the
    pwd and ls commands at any point in the construction process to verify
    the fidelity of your structure.  
    
    Once you have finished building each structure, use the appropriate file
    maintenance commands to completely undo what you have done above. Show a
    list of exactly what commands you used in sequence to undo the structure
    for each figure.  "Undo" means delete the directories and files created
    for that figure, except for files 1st and 2nd. The files 1st and 2nd must
    remain in your home directory after you have undone the directory and file
    structure for any particular figure, so that you can use them to create
    the structure for the next figure.

    Copy and paste the session for each activity below.

    figure 1:


    figure 1 - undo:


    figure 2:


    figure 2 - undo:


    figure 3:


    figure 3 - undo:


    figure 4:


    figure 4 - undo:



2.  
    Use the man command on your Unix system to construct a list of one
    sentence long descriptions for all commands found in chapter 3 of the
    textbook. Put the Description part of the manual page that you see
    displayed on-screen into your own words in one-sentence format, being
    careful to include the most important aspect(s) of the command as you
    find them stated in the description.