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README.txt - Exercise #4 Instructions
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Ian! D. Allen - idallen@ncf.ca

This is what you must do for Exercise #4.

This compressed archive contains several files in a hidden directory.

1)  Create an empty directory and cd into it.  This will be your
    "submission directory".  Make sure there are no files in this new,
    empty directory.

2)  Extract the contents of the exercise04.tar.gz file.
    Look for and find the compressed text file list.txt.gz
    Find the last 5 digits of your Student Number in this file.
    Beside those digits is a list of 15 question numbers.  You must
    answer only these 15 question numbers, below.

3)  Now find the compressed text file questions.txt.gz
    Put an uncompressed copy of the file into "myanswers.txt".  Use VI to
    edit the "myanswers.txt" file and answer your assigned 15 questions
    by replacing the numbered question lines with the appropriate answer
    output, as shown below.

4)  Find the compressed text file answers.txt.gz
    This file contains sample correct answers for the questions.
    You can copy these answers or generate your own.  If you do copy the
    answers from this file, make sure the answers reflect *your* userid and
    not the userid in the answers.txt file!  (Edit the userid to be yours.)

    For example, if you were assigned question number 45, you would look
    for question number 45 in the myanswers.txt file:

       $ echo 'a    b' hi          there
       45. REPLACE THIS ENTIRE LINE: what output here?

    Either run the command shown, or find the same question in the
    answers.txt file.  Use VI to replace the indicated line with the
    correct output answer, as follows:

       $ echo 'a    b' hi          there
       a    b hi there

    You must replace the entire "REPLACE THIS" line with the exact
    answer, including spaces and punctuation.  The easiest way to do
    this accurately is to run two windows:  In one window, follow the
    questions.txt file and run the commands needed to generate the output,
    and redirect the output of the last command into a temporary file.
    In the other window, edit the myanswers.txt file and use ":r tempfile"
    to read in the temporary file after each answer.

    Using the above example, in one window I would type this:

       $ echo 'a    b' hi          there >tempfile

    In my other VIM editor window, I would position my cursor on question
    45 in myanswers.txt and then type ":r tempfile" to read in the output
    line from the temp file that I just created.  The myanswers.txt file
    would then look like this:

       $ echo 'a    b' hi          there
       45. REPLACE THIS ENTIRE LINE: what output here?
       a    b hi there

    I would then delete the entire "REPLACE THIS" line, leaving only
    the correct answer line in myanswers.txt:

       $ echo 'a    b' hi          there
       a    b hi there

    Repeat for all 15 questions.

    You can make sure your answer is correct by verifying it against
    the correct answers in the answers.txt file.  (Make sure you get
    the quotes correct on those lines!)

    Do not delete or change anything else in the myanswers.txt file
    other than the 15 lines that are your assigned questions.  Leave
    the rest of the file exactly as it was.

5)  When you are done, use diff to compare the original questions.txt
    file with your modified version in myanswers.txt and save the output
    in a file named diffout.txt.  You should see *only* 15 sections of
    differences, one for each question you answered.  The output might
    resemble this:

	$ diff questions.txt myanswers.txt >diffout.txt
	$ cat diffout.txt
	154c154
	< 45. REPLACE THIS ENTIRE LINE: what output here?
	---
	> a    b hi there

	[...repeat for each of 15 questions...]

    If you see more than 15 sections with differences, something is wrong!

6)  Put a copy of your Exterior Assignment Submission Label into a file
    named "file1.txt" in this submission directory.  Use the exact 7-line
    (plus optional comments) format described online and in previous
    exercises.  (Make sure your file1.txt file has at least seven lines
    in it.)

7)  Put the output of "pwd" in this directory into a file named "file2.txt".

8)  Put the output of running the command "sum *" in this directory into
    a file named "file3.txt".

9)  Put the output of running the command "wc *" in this directory into
    a file named "file4.txt".

10) Put the output of running the command "ls -lia" in this directory into
    a file named "file5.txt". 

11) Submit everything in this directory for marking as Exercise 04,
    using the following ACADUNIX command line:

       $ ~alleni/bin/submit 04 *

    This "submit" program will copy everything ("*") in the current
    directory to my Exercise 04 directory for marking.  (The GLOB pattern
    "*" matches all non-hidden files in the current directory.)

    Your final submission should include only these files:

	file1.txt file2.txt file3.txt file4.txt file5.txt
        questions.txt myanswers.txt diffout.txt

    You don't need to submit any of the other files.

12) Verify that you submitted everything, using this command line:

       $ ~alleni/bin/submit 04 -l

    You may redo this exercise and re-submit your results as many times as
    you like.  I will mark the most recent submission that is submitted
    before the final hand-in cutoff date.  (Make sure you include all
    the above files in every submission.)

    For Exercise 04, always use "04" as the first argument to "submit".