CMSC216 Lab01: Basic Setup

                           _________________

                            LAB01 QUESTIONS
                           _________________





Exercise Instructions
=====================

  Follow the instructions below to experiment with topics related to
  this exercise.
  - For sections marked QUIZ, fill in an (X) for the appropriate
    response in this file. Use the command `make test-quiz' to see if
    all of your answers are correct.
  - For sections marked CODE, complete the code indicated. Use the
    command `make test-code' to check if your code is complete.
  - DO NOT CHANGE any parts of this file except the QUIZ sections as it
    may interfere with the tests otherwise.
  - If your `QUESTIONS.txt' file seems corrupted, restore it by copying
    over the `QUESTIONS.txt.bk' backup file.
  - When you complete the exercises, check your answers with `make test'
    and if all is well, create a zip file with `make zip' and upload it
    to Gradescope. Ensure that the Autograder there reflects your local
    results.
  - IF YOU WORK IN A GROUP only one member needs to submit and then add
    the names of their group.

  Follow the instructions below. For sections marked QUIZ, mark one of
  the multiple choices with an X.


Unix Terminal Basics
====================

  Explore the UNIX terminal a bit. Ask for help from a classmate or
  Staff member if you don't know how to open a terminal on your system.

  Type the below commands in and then indicate what their purpose is.


QUIZ Secure Shell
~~~~~~~~~~~~~~~~~

  All recent major platforms (Windows / Mac / Linux) come with the `ssh
  / scp' tools pre-installed.

  What does the following command do?
  ,----
  | > ssh kauf0095@grace.umd.edu
  `----


  - ( ) Silences the user `kauff095' on the machine `grace' so that user
    can no longer type any commands and must reset their password.
  - ( ) Opens an unsecure connection to the machine `grace' for the user
    `kauf0095' and allows anyone typing to the command to act as that
    user on `grace' without password verification and without any
    encryption of the connection.
  - ( ) Opens a secure connection to the machine `grace' for the user
    `kauf0095' and, after verifying a password/2-factor authentication,
    opens a terminal/shell on that machine for further commands.


  What does the following command do?
  ,----
  | > scp ./lab01-code.zip kauf0095@grace.umd.edu:cmsc216/
  `----

  - ( ) Copies a file from the Grace server to a local machine (laptop)
  - ( ) Copies a file from a local machine (laptop) to the Grace
    server's cmsc216 folder

  What does the following command do?
  ,----
  | > scp kauf0095@grace.umd.edu:cmsc216/lab01-complete.zip .
  `----

  - ( ) Copies a file from the Grace server's cmsc216 folder to a local
    machine (laptop)
  - ( ) Copies a file from a local machine (laptop) to the Grace
    server's csmc216 folder


QUIZ Retrieving Codepacks
~~~~~~~~~~~~~~~~~~~~~~~~~

  Which of the following is a viable way to get a codepack like
  `lab01-code.zip' onto Grace?

  - ( ) Download the code to your laptop and use `scp' to transfer the
    codepack from the laptop to Grace
  - ( ) On Grace, use `wget' to download the code directly from a web
    address
  - ( ) Use a graphical file transfer program like MobaXTerm or an SFTP
    client to move files to Grace from the local machine
  - ( ) All of these are possible BUT using `wget' is usually the
    quickest way to initially get a codepack to Grace from the web.


QUIZ UNIX Command Basics
~~~~~~~~~~~~~~~~~~~~~~~~

  What does the following command sequence do?
  ,----
  | > cd ~                          # 1 
  | > mkdir csci2021                # 2 
  | > cd csci2021                   # 3 
  | > ls                            # 4 
  | > cd ..                         # 5 
  `----

  ,----
  | - ( ) 1. Changes to your home directory/folder
  |       2. Creates a folder named csci2021
  |       3. Changes the directory csci2021 to be your home folder
  |       4. lists the files in the current folder, 
  |       5. changes the directory .. to be your home folder
  | 
  | - ( ) 1. Creates a directory/folder named ~ (tilde) 
  |       2. creates a file named csci2021, 
  |       3. creates a second folder csci2021, 
  |       4. lists the files in the current folder, 
  |       5. moves up one folder
  | 
  | - ( ) 1. Changes to your home directory/folder, 
  |       2. creates a folder named csci2021
  |       3. changes into the folder csci2021, 
  |       4. lists the files in the current folder,
  |       5. moves up one folder
  `----


Checking Your Quiz Answers
==========================

  To check if your quiz answers are correct, open a terminal and change
  into the `lab01-code' directory.  Type the command
  ,----
  | > make test-quiz
  `----

  which will report either success or a failure.  The test does not
  report WHICH questions are incorrect and if you get stuck, get some
  help from a staff member to sort out which of the multiple choice
  questions above is incorrect.


CODE in hello_c.c
=================

  Open up and examine the file `hello_c.c'.  This is a C program and to
  see what it in action, you will need to compile and run it in a
  terminal.  Navigate your terminal to the `lab01-code' directory.  You
  can use the provided build tools to create the C program by typing
  ,----
  | > make
  `----

  This should provide output which runs the `gcc' compiler and creates
  the runnable program `hello_c': notices the lack of the `.c'
  extension. A session of compiling, running, and testing the program is
  below with commentary on the right.
  ,----
  | > make                # compile the program 'hello_c'
  | gcc -Wall -Wno-comment -Werror -g  -o hello_c hello_c.c
  | 
  | > file hello_c        # check file type of program
  | hello_c: ELF 64-bit LSB pie executable, x86-64, version
  | 
  | > ./hello_c           # run compiled program
  | Goodbye Python. Goodbye Java.
  | ...
  | 
  | > make test-code
  | ./testy test_lab01.org 2
  | ============================================================
  | == test_lab01.org : Lab01 Tests
  | == Running 1 / 2 tests
  | 2)  CODE: hello_c output : FAIL -> results in file 'test-results/lab01-02-result.tmp'
  | ============================================================
  | RESULTS: 0.00 / 1.00 tests passed
  | 
  | 
  | ============================================================
  | == FAILURE RESULTS
  | ============================================================
  | (TEST 2) CODE: hello_c output
  | COMMENTS:
  | Runs the program 'hello_c' which must already be compiled and checks
  | ...
  `----

  As indicated in the comments in `hello_c.c', there are a number of
  typos, missing, and extraneous lines printed by the program.  To make
  the code pass the tests, you will simply need to correct `hello_c.c'
  to match the output expected for the test.  As the Comments for the
  CODE test indicate, failures report differences between the expected
  and actual output with symbols between the side-by-side
  comparison. These symbols are those used by the comparison program
  `diff' and are as follows:
  ,----
  | > means there is an extra ACTUAL line that doesn't match anything in EXPECT
  | < means there is a line missing in ACTUAL that is present in EXPECT
  | | means the lines match closely but some characters differ
  `----

  Edit code in `hello_c.c' so that the output matches and testing the
  code produces a success:
  ,----
  | > make test-code
  | gcc -Wall -Wno-comment -Werror -g  -o hello_c hello_c.c
  | ./testy test_lab01.org 2
  | ============================================================
  | == test_lab01.org : Lab01 Tests
  | == Running 1 / 2 tests
  | 2)  CODE: hello_c output : ok
  | ============================================================
  | RESULTS: 1.00 / 1.00 tests passed
  `----


Submitting a Zip for Gradescope
===============================

  Once you have your QUIZ answers for the `QUESTIONS.txt' file correct
  and your CODE completed, do one final check via `make test':
  ,----
  | > make test
  | ./testy test_lab01.org
  | ============================================================
  | == test_lab01.org : Lab01 Tests
  | == Running 2 / 2 tests
  | 1)  QUIZ: QUESTIONS.txt  : ok
  | 2)  CODE: hello_c output : ok
  | ============================================================
  | RESULTS: 1.00 / 1.00 tests passed
  `----
  If everything looks ok, you are ready to submit.  Do so by creating a
  zip file via `make zip'
  ,----
  | > make zip
  | rm -f hello_c  *.o
  | rm -rf test-results
  | rm -f lab01-code.zip
  | cd .. && zip "lab01-code/lab01-code.zip" -r "lab01-code"
  | 	zip warning: name not matched: lab01-code/test_lab01.org~
  |   adding: lab01-code/ (stored 0%)
  |   adding: lab01-code/QUESTIONS.md5 (stored 0%)
  |   adding: lab01-code/QUESTIONS.txt (deflated 61%)
  |   adding: lab01-code/QUESTIONS.txt.bk (deflated 61%)
  |   adding: lab01-code/testy (deflated 73%)
  |   adding: lab01-code/hello_c.c (deflated 51%)
  |   adding: lab01-code/Makefile (deflated 60%)
  |   adding: lab01-code/test_lab01.org (deflated 47%)
  | Zip created in lab01-code.zip
  `----

  The zip file named `lab01-code.zip' should be uploaded to Gradescope
  under the Lab01 assignment. Once uploaded, the same `make test' check
  will be run and you should verify its success as this will earn you
  your lab Engagement Point (1% of your overall grade).

  IF YOU ARE WORKING IN A GROUP: only one student needs to upload the
  Zip file and can add up to 4 other students (groups of 5) to the
  submission who will also receive credit for the lab work.