Linux Shell and Bash

• Bash Tutorial
• Variable Prerequisites
  • Define variable
  • Output the value of a variable
• Project Setup and Analysis with Bash Scripts
  • Pull Code
  • Look at files Github project
  • Look at file list with hidden and long attributes
  • Look inside a Markdown File
• Env, Git and GitHub
• Advanced Student Request - Make a file in Bash
• Hack Preparation.

%%script bash
## Personal Experimentation
echo "Hello World!"
echo "Using the echo command!"

Hello World!
Using the echo command!

Bash Tutorial

A brief overview of Bash, on your way to becoming a Linux expert. When a computer boots up, a kernel (MacOS, Windows, Linux) is started. This kernel provides a shell, or terminal, that allows user to interact with a most basic set of commands. Typically, the casual user will not interact with the shell/terminal as a Desktop User Interface is started by the computer boot up process. To activate a shell directly, users will run a “terminal” through the Desktop. VS Code provides ability to activate "terminal" while in the IDE.

Variable Prerequisites

Setup bash shell dependency variables for this page. Variables are one of the first aspects of programming. Variables have "name" and a "value".

• Hack Note: Change variables to match your student project.

Define variable

The following code cell defines 3 variables and assigns each a value. There are some extra command, called a HERE document, that write these variables to a file. This is so we can use these variables over and over below.

%%script bash

# Dependency Variables, set to match your project directories

cat <<EOF > /tmp/variables.sh
export project_dir=$HOME/vscode  # change vscode to different name to test git clone
export project=\$project_dir/teacher  # change teacher to name of project from git clone
export project_repo="https://github.com/nighthawkcoders/teacher.git"  # change to project of choice
EOF

Output the value of a variable

The following code cell outputs the value of the variables, using the echo command. For visual understanding in the output, each echo command provide a title before the $variable

%%script bash

# Extract saved variables
source /tmp/variables.sh

# Output shown title and value variables
echo "Project dir: $project_dir"
echo "Project: $project"
echo "Repo: $project_repo"

Project dir: /home/kasm-user/vscode
Project: /home/kasm-user/vscode/teacher
Repo: https://github.com/nighthawkcoders/teacher.git

Project Setup and Analysis with Bash Scripts

The bash scripts that follow automate what was done in the setup procedures. The purpose of this is to show that many of the commands we performed can be added to a script, then performed automatically.

Pull Code

Pull code from GitHub to your machine. This is a bash script, a sequence of commands, that will create a project directory and add the “project” from GitHub to the vscode directory. There is conditional logic to make sure that clone only happen if it does not (!) exist. Here are some key elements in this code…

• cd command (change directory), remember this from terminal session
• if statements (conditional statement, called selection statement by College Board), code inside only happens if condition is met

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Using conditional statement to create a project directory and project"

cd ~    # start in home directory

# Conditional block to make a project directory
if [ ! -d $project_dir ]
then 
    echo "Directory $project_dir does not exists... makinng directory $project_dir"
    mkdir -p $project_dir
fi
echo "Directory $project_dir exists." 

# Conditional block to git clone a project from project_repo
if [ ! -d $project ]
then
    echo "Directory $project does not exists... cloning $project_repo"
    cd $project_dir
    git clone $project_repo
    cd ~
fi
echo "Directory $project exists." 

Using conditional statement to create a project directory and project
Directory /home/kasm-user/vscode exists.
Directory /home/kasm-user/vscode/teacher exists.

Look at files Github project

All computers contain files and directories. The clone brought more files from cloud to your machine. Review the bash shell script, observe the commands that show and interact with files and directories. These were used during setup.

• “ls” lists computer files in Unix and Unix-like operating systems
• “cd” offers way to navigate and change working directory
• “pwd” print working directory
• “echo” used to display line of text/string that are passed as an argument

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Navigate to project, then navigate to area wwhere files were cloned"
cd $project
pwd

echo ""
echo "list top level or root of files with project pulled from github"
ls

Navigate to project, then navigate to area wwhere files were cloned
/home/kasm-user/vscode/teacher

list top level or root of files with project pulled from github
assets
_config.yml
csa.md
csp.md
csse.md
_data
Gemfile
Gemfile.lock
images
_includes
indexBlogs.md
index.md
_layouts
LICENSE
Makefile
_notebooks
_posts
README.md
scripts
_site

Look at file list with hidden and long attributes

Most linux commands have options to enhance behavior. The enhanced listing below shows permission bits, owner of file, size and date.

ls reference

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Navigate to project, then navigate to area wwhere files were cloned"
cd $project
pwd

echo ""
echo "list all files in long format"
ls -al   # all files -a (hidden) in -l long listing

Navigate to project, then navigate to area wwhere files were cloned
/home/kasm-user/vscode/teacher

list all files in long format
total 112
drwxr-xr-x 13 kasm-user kasm-user 4096 Sep  5 18:21 .
drwxr-xr-x  8 kasm-user kasm-user 4096 Aug 30 19:57 ..
drwxr-xr-x  4 kasm-user kasm-user 4096 Aug 18 19:31 assets
-rw-r--r--  1 kasm-user kasm-user  607 Aug 18 19:31 _config.yml
-rw-r--r--  1 kasm-user kasm-user   92 Aug 18 19:31 csa.md
-rw-r--r--  1 kasm-user kasm-user   98 Aug 18 19:31 csp.md
-rw-r--r--  1 kasm-user kasm-user  108 Aug 18 19:31 csse.md
drwxr-xr-x  2 kasm-user kasm-user 4096 Aug 18 19:31 _data
-rw-r--r--  1 kasm-user kasm-user  122 Aug 18 19:31 Gemfile
-rw-r--r--  1 kasm-user kasm-user 7294 Aug 18 19:35 Gemfile.lock
drwxr-xr-x  8 kasm-user kasm-user 4096 Sep  5 18:21 .git
drwxr-xr-x  3 kasm-user kasm-user 4096 Aug 18 19:31 .github
-rw-r--r--  1 kasm-user kasm-user  176 Aug 28 18:16 .gitignore
drwxr-xr-x  4 kasm-user kasm-user 4096 Sep  5 18:21 images
drwxr-xr-x  2 kasm-user kasm-user 4096 Aug 28 18:16 _includes
-rw-r--r--  1 kasm-user kasm-user   53 Aug 18 19:31 indexBlogs.md
-rw-r--r--  1 kasm-user kasm-user 5149 Aug 18 19:31 index.md
drwxr-xr-x  2 kasm-user kasm-user 4096 Aug 18 19:31 _layouts
-rw-r--r--  1 kasm-user kasm-user 1081 Aug 18 19:31 LICENSE
-rw-r--r--  1 kasm-user kasm-user 3136 Sep  5 18:21 Makefile
drwxr-xr-x  3 kasm-user kasm-user 4096 Sep  5 18:21 _notebooks
drwxr-xr-x  2 kasm-user kasm-user 4096 Sep  5 18:21 _posts
-rw-r--r--  1 kasm-user kasm-user 6853 Sep  5 18:21 README.md
drwxr-xr-x  2 kasm-user kasm-user 4096 Aug 21 18:27 scripts
drwxr-xr-x 13 kasm-user kasm-user 4096 Aug 21 18:50 _site

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Look for posts"
export posts=$project/_posts  # _posts inside project
cd $posts  # this should exist per fastpages
pwd  # present working directory
ls -l  # list posts

Look for posts
/home/kasm-user/vscode/teacher/_posts
total 108
-rw-r--r-- 1 kasm-user kasm-user  4650 Aug 18 19:31 2023-08-16-pair_programming.md
-rw-r--r-- 1 kasm-user kasm-user  7685 Aug 18 19:31 2023-08-16-Tools_Equipment.md
-rw-r--r-- 1 kasm-user kasm-user  7139 Aug 28 18:16 2023-08-17-markdown-html_fragments.md
-rw-r--r-- 1 kasm-user kasm-user  4687 Aug 28 18:16 2023-08-21-python_flask.md
-rw-r--r-- 1 kasm-user kasm-user  6670 Aug 28 18:16 2023-08-23-javascript-calculator.md
-rw-r--r-- 1 kasm-user kasm-user 10691 Sep  5 18:21 2023-08-30-agile_methodolgy.md
-rw-r--r-- 1 kasm-user kasm-user  4397 Sep  5 18:21 2023-08-30-javascript-music-api.md
-rw-r--r-- 1 kasm-user kasm-user  5312 Aug 28 18:16 2023-09-06-javascript-motion-mario-oop.md
-rw-r--r-- 1 kasm-user kasm-user  3688 Sep  5 18:21 2023-09-12-python-flask-repo.md
-rw-r--r-- 1 kasm-user kasm-user  2848 Sep  5 18:21 2023-09-12-unit-1-summary.md
-rw-r--r-- 1 kasm-user kasm-user  4812 Aug 18 19:31 2023-09-13-java-free_response.md
-rw-r--r-- 1 kasm-user kasm-user 13219 Aug 28 18:16 2023-10-16-java-api-pojo-jpa.md
-rw-r--r-- 1 kasm-user kasm-user  6819 Aug 18 19:31 2023-11-13-jwt-java-spring.md

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Look for notebooks"
export notebooks=$project/_notebooks  # _notebooks is inside project
cd $notebooks   # this should exist per fastpages
pwd  # present working directory
ls -l  # list notebooks

Look for notebooks
/home/kasm-user/vscode/teacher/_notebooks
total 1956
-rw-r--r-- 1 kasm-user kasm-user 992100 Aug 28 18:16 2023-07-15-machine_learning.ipynb
-rw-r--r-- 1 kasm-user kasm-user  13245 Sep  5 18:21 2023-07-29-cloud_database.ipynb
-rw-r--r-- 1 kasm-user kasm-user  43705 Aug 28 18:16 2023-07-29-cloud-workspace-automation.ipynb
-rw-r--r-- 1 kasm-user kasm-user   3584 Aug 28 18:16 2023-07-30-mario_overview.ipynb
-rw-r--r-- 1 kasm-user kasm-user  10600 Aug 28 18:16 2023-08-01-mario_player.ipynb
-rw-r--r-- 1 kasm-user kasm-user  14783 Aug 28 18:16 2023-08-02-mario_platform.ipynb
-rw-r--r-- 1 kasm-user kasm-user  22612 Aug 28 18:16 2023-08-03-mario_tube.ipynb
-rw-r--r-- 1 kasm-user kasm-user  25779 Aug 28 18:16 2023-08-04-mario_block.ipynb
-rw-r--r-- 1 kasm-user kasm-user  26462 Aug 28 18:16 2023-08-05-mario_goomba.ipynb
-rw-r--r-- 1 kasm-user kasm-user  30617 Aug 28 18:16 2023-08-06-mario_background.ipynb
-rw-r--r-- 1 kasm-user kasm-user  10283 Aug 28 18:16 2023-08-15-java-hello.ipynb
-rw-r--r-- 1 kasm-user kasm-user  26361 Aug 28 18:16 2023-08-16-github_pages_setup.ipynb
-rw-r--r-- 1 kasm-user kasm-user  16157 Aug 28 18:18 2023-08-16-linux_shell.ipynb
-rw-r--r-- 1 kasm-user kasm-user  11466 Aug 18 19:31 2023-08-16-python_hello.ipynb
-rw-r--r-- 1 kasm-user kasm-user  11158 Aug 28 18:16 2023-08-23-github_pages_anatomy.ipynb
-rw-r--r-- 1 kasm-user kasm-user  23636 Aug 28 18:16 2023-08-23-java-console_games.ipynb
-rw-r--r-- 1 kasm-user kasm-user   9663 Sep  5 18:21 2023-08-23-python_tricks.ipynb
-rw-r--r-- 1 kasm-user kasm-user  11546 Sep  5 18:21 2023-08-29-basics-of-js.ipynb
-rw-r--r-- 1 kasm-user kasm-user   3214 Aug 28 18:16 2023-08-30-javascript_grab.ipynb
-rw-r--r-- 1 kasm-user kasm-user   9858 Sep  5 18:21 2023-08-30-js-with-html.ipynb
-rw-r--r-- 1 kasm-user kasm-user   9689 Aug 18 19:31 2023-08-30-showcase-S1-pair.ipynb
-rw-r--r-- 1 kasm-user kasm-user  14380 Aug 18 19:31 2023-09-06-java-primitives.ipynb
-rw-r--r-- 1 kasm-user kasm-user  11501 Sep  5 18:21 2023-09-06-javascript-input.ipynb
-rw-r--r-- 1 kasm-user kasm-user  14910 Sep  5 18:21 2023-09-06-javascript-output-jquery.ipynb
-rw-r--r-- 1 kasm-user kasm-user   8892 Sep  5 18:21 2023-09-06-python-flask_in_jupyter.ipynb
-rw-r--r-- 1 kasm-user kasm-user  15944 Sep  5 18:21 2023-09-12-AP-python_lists.ipynb
-rw-r--r-- 1 kasm-user kasm-user  13706 Aug 28 18:16 2023-09-12-java_menu_class.ipynb
-rw-r--r-- 1 kasm-user kasm-user   7174 Sep  5 18:21 2023-09-12-python-flask-anatomy.ipynb
-rw-r--r-- 1 kasm-user kasm-user   9562 Aug 18 19:31 2023-09-13-java_fibonaccii_class.ipynb
-rw-r--r-- 1 kasm-user kasm-user  28297 Sep  5 18:31 2023-09-13-javascript_output_api.ipynb
-rw-r--r-- 1 kasm-user kasm-user   8474 Sep  5 18:21 2023-09-13-python-errors_fries.ipynb
-rw-r--r-- 1 kasm-user kasm-user  43423 Aug 18 19:31 2023-09-13-python-pandas_intro.ipynb
-rw-r--r-- 1 kasm-user kasm-user  22313 Sep  5 18:21 2023-09-17-python-images-U2-2.ipynb
-rw-r--r-- 1 kasm-user kasm-user  34764 Sep  5 18:21 2023-09-18-python-pandas-U2-3.ipynb
-rw-r--r-- 1 kasm-user kasm-user  49093 Sep  5 18:21 2023-09-19-python-sql-U2-4a.ipynb
-rw-r--r-- 1 kasm-user kasm-user  11553 Sep  5 18:21 2023-09-19-python-sql-U2-4b.ipynb
-rw-r--r-- 1 kasm-user kasm-user  11578 Aug 28 18:16 2023-09-20-java-image_2D.ipynb
-rw-r--r-- 1 kasm-user kasm-user  26732 Aug 28 18:16 2023-09-20-javascript_motion_dog.ipynb
-rw-r--r-- 1 kasm-user kasm-user  22157 Sep  5 18:21 2023-09-27-aws-deployment.ipynb
-rw-r--r-- 1 kasm-user kasm-user  13599 Aug 28 18:16 2023-10-02-java-spring-anatomy.ipynb
-rw-r--r-- 1 kasm-user kasm-user  12429 Aug 28 18:16 2023-10-09-java-chatgpt.ipynb
-rw-r--r-- 1 kasm-user kasm-user  15632 Aug 18 19:31 2023-10-09-javascript_api.ipynb
-rw-r--r-- 1 kasm-user kasm-user 113091 Aug 18 19:31 2023-10-09-python_machine_learing_fitness.ipynb
-rw-r--r-- 1 kasm-user kasm-user  20077 Aug 28 18:16 2023-10-16-java_jpa.ipynb
-rw-r--r-- 1 kasm-user kasm-user  16271 Aug 18 19:31 2023-11-13-jwt-python-flask.ipynb
-rw-r--r-- 1 kasm-user kasm-user  15951 Aug 18 19:31 2023-11-13-vulnerabilities.ipynb
-rw-r--r-- 1 kasm-user kasm-user  18328 Aug 18 19:31 2023-11-20-jwt-java-spring-challenge.md
-rw-r--r-- 1 kasm-user kasm-user  10745 Aug 18 19:31 2024-01-04-cockpit-setup.ipynb
drwxr-xr-x 2 kasm-user kasm-user   4096 Aug 18 19:31 files

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Look for images in notebooks, print working directory, list files"
cd $notebooks/images  # this should exist per fastpages
pwd
ls -l

Look for images in notebooks, print working directory, list files
/home/kasm-user/vscode/GavinCopley.github.io/_notebooks
total 120
-rw-r--r-- 1 kasm-user kasm-user 16359 Sep  6 20:03 2023-08-16-linux_shell.ipynb
-rw-r--r-- 1 kasm-user kasm-user  5515 Aug 30 19:57 2023-08-17-Markdown_Table_Code_Hack.ipynb
-rw-r--r-- 1 kasm-user kasm-user  8957 Aug 30 19:57 2023-08-21-HTML_Image_Hack.ipynb
-rw-r--r-- 1 kasm-user kasm-user  1831 Aug 29 19:51 2023-08-24-First_Blog.ipynb
-rw-r--r-- 1 kasm-user kasm-user 17562 Aug 30 19:57 2023-08-30-Calculator.ipynb
-rw-r--r-- 1 kasm-user kasm-user  1515 Sep  6 19:46 2023-08-31-Review_Ticket_1.ipynb
-rw-r--r-- 1 kasm-user kasm-user  3097 Sep  1 18:26 2023-08-31-Review_Ticket.ipynb
-rw-r--r-- 1 kasm-user kasm-user  1352 Sep  5 18:41 2023-09-01-plan_2.ipynb
-rw-r--r-- 1 kasm-user kasm-user  1809 Sep  6 19:53 2023-09-04-plan_3.ipynb
-rw-r--r-- 1 kasm-user kasm-user 44175 Sep  6 20:03 2023-09-05-javascript_output_api.ipynb


bash: line 6: cd: /images: No such file or directory

Look inside a Markdown File

“cat” reads data from the file and gives its content as output

%%script bash

# Extract saved variables
source /tmp/variables.sh

echo "Navigate to project, then navigate to area wwhere files were cloned"

cd $project
echo "show the contents of README.md"
echo ""

cat README.md  # show contents of file, in this case markdown
echo ""
echo "end of README.md"

Navigate to project, then navigate to area wwhere files were cloned
show the contents of README.md

## Teacher Blog site
This site is intended for the development of Teacher content.  This blogging site is built using GitHub Pages [GitHub Pages](https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-github-pages-site).
- The purpose is to build lessons and distribute across different Computer Science sections (CSSE, CSP, CSA), a pathway that covers 3 years of High School instruction.
- The primary languages and frameworks that are taught are `JavaScript/HTML/CSS`, `Python/Flask`, `Java/Spring`.  Read below for more details.
- In this course, Teacher content is not exclusively developed by Teachers.  In fact, many Students have been invited to develop and publish content into this repository.  Their names will appear as authors on the content which they aided in producing.
- This site has incorporated ideas and has radically modified scripts from the now deprecated [fastpages](https://github.com/fastai/fastpages) repository.
- This site includes assistance and guideance from ChatGPT, [chat.openai.com](https://chat.openai.com/) 

### Courses and Pathway
The focus of the Del Norte Computer Science three-year pathway is `Full Stack Web Development`.  This focus provides a variety of technologies and exposures.  The intention of the pathway is breadth and exposure.
- `JavaScript` documents are focused on frontend development and for entry class into the Del Norte Computer Science pathway.  JavaScript documents and materials are a prerequisites to Python and Java classes.
- `Python` documents are focused on backend development and requirements for the AP Computer Science Principles exam.
- `Java` documents are focused on backend development and requirements for the AP Computer Sciene A exam.
- `Data Structures` materials embedded into JavaScript, Python, or Java documents are focused on college course articulation.

### Resources and Instruction
The materials, such as this README, as well as `Tools`, `DevOps`, and `Collaboration` resources are integral part of this course and Computer Science in general.  Everything in our environment is part of our learning of Computer Science. 
- `Visual Studio Code` is key the code-build-debug cycle editor used in this course, [VSCode download](https://code.visualstudio.com/).  This is an example of a resource, but inside of it it has features for collaboration.
- `Tech Talks`, aka lectures, are intended to be interactive and utilize `Jupyter Notebooks` and Websites.  This is an example of blending instruction and tools together, which in turn provide additional resources for learning.  For instance, deep knowledge on  GitHub Pages and Notebooks are valuable in understanding principles behind Full Stack Development and Data Science. 

## GitHub Pages
All `GitHub Pages` websites are managed on GitHub infrastructure. GitHub uses `Jekyll` to tranform your content into static websites and blogs. Each time we change files in GitHub it initiates a GitHub Action that rebuilds and publishes the site with Jekyll.  
- GitHub Pages is powered by: [Jekyll](https://jekyllrb.com/).
- Publised teacher website: [nighthawkcoders.github.io/teacher](https://nighthawkcoders.github.io/teacher/)

## Preparing a Preview Site 
In all development, it is recommended to test your code before deployment.  The GitHub Pages development process is optimized by testing your development on your local machine, prior to files on GitHub

Development Cycle. For GitHub pages, the tooling described below will create a development cycle  `make-code-save-preview`.  In the development cycle, it is a requirement to preview work locally, prior to doing a VSCode `commit` to git.

Deployment Cycle.  In the deplopyment cycle, `sync-github-action-review`, it is a requirement to complete the development cycle prior to doing a VSCode `sync`.  The sync triggers github repository update.  The action starts the jekyll build to publish the website.  Any step can have errors and will require you to do a review.

### WSL and/or Ubuntu installation requirements
- The result of these step is Ubuntu tools to run preview server.  These procedures were created using [jekyllrb.com](https://jekyllrb.com/docs/installation/ubuntu/)
```bash
# 
# WSL/Ubuntu setup
#
mkdir mkdir vscode
git clone https://github.com/nighthawkcoders/teacher.git
# run script, path vscode/teacher are baked in script
~/vscode/teacher/scripts/activate_ubuntu.sh
#=== !!!Start a new Terminal!!! ===
#=== Continue to next section ===
```

### MacOs installation requirements 
- Ihe result of these step are MacOS tools to run preview server.  These procedures were created using [jekyllrb.com](https://jekyllrb.com/docs/installation/macos/). 

```bash
# 
# MacOS setup
#
mkdir mkdir vscode
git clone https://github.com/nighthawkcoders/teacher.git
# run script, path vscode/teacher are baked in script
~/vscode/teacher/scripts/activate_macos.sh
#=== !!!Start a new Terminal!!! ===
#=== Continue to next section ===
```


### Run Preview Server
- The result of these step is server running on: http://0.0.0.0:4100/teacher/.  Regeneration messages will run in terminal on any save and update site upon refresh.  Terminal is active, press the Enter or Return key in the terminal at any time to see prompt to enter commands.

- Complete installation
```bash
cd ~/vscode/teacher
bundle install
make
```
- Run Server.  This requires running terminal commands `make`, `make stop`, `make clean`, or `make convert` to manage the running server.  Logging of details will appear in terminal.   A `Makefile` has been created in project to support commands and start processes.

    - Start preview server in terminal
    ```bash
    cd ~/vscode/teacher  # my project location, adapt as necessary
    make
    ```

    - Terminal output of shows server address. Cmd or Ctl click http location to open preview server in browser. Example Server address message... 
    ```
    Server address: http://0.0.0.0:4100/teacher/
    ```

    - Save on ipynb or md activiates "regeneration". Refresh browser to see updates. Example terminal message...
    ```
    Regenerating: 1 file(s) changed at 2023-07-31 06:54:32
        _notebooks/2024-01-04-cockpit-setup.ipynb
    ```

    - Terminal message are generated from background processes.  Click return or enter to obtain prompt and use terminal as needed for other tasks.  Alway return to root of project `cd ~/vscode/teacher` for all "make" actions. 
        

    - Stop preview server, but leave constructed files in project for your review.
    ```bash
    make stop
    ```

    - Stop server and "clean" constructed files, best choice when renaming files to eliminate potential duplicates in constructed files.
    ```bash
    make clean
    ```

    - Test notebook conversions, best choice to see if IPYNB conversion is acting up.
    ```bash
    make convert
    ```
    
end of README.md

Env, Git and GitHub

Env(ironment) is used to capture things like path to Code or Home directory. Git and GitHub is NOT Only used to exchange code between individuals, it is often used to exchange code through servers, in our case deployment for Website. All tools we use have a behind the scenes relationships with the system they run on (MacOS, Windows, Linus) or a relationship with servers which they are connected to (ie GitHub). There is an “env” command in bash. There are environment files and setting files (.git/config) for Git. They both use a key/value concept.

• “env” show setting for your shell
• “git clone” sets up a director of files
• “cd $project” allows user to move inside that directory of files
• “.git” is a hidden directory that is used by git to establish relationship between machine and the git server on GitHub.

%%script bash

# This command has no dependencies

echo "Show the shell environment variables, key on left of equal value on right"
echo ""

env

Show the shell environment variables, key on left of equal value on right

SHELL=/bin/bash
SESSION_MANAGER=local/kasm:@/tmp/.ICE-unix/84,unix/kasm:/tmp/.ICE-unix/84
VNCOPTIONS=-PreferBandwidth -DynamicQualityMin=4 -DynamicQualityMax=7 -DLP_ClipDelay=0 -select-de manual
XDG_CONFIG_DIRS=/etc/xdg
PYTHONUNBUFFERED=1
XDG_MENU_PREFIX=xfce-
APPLICATION_INSIGHTS_NO_DIAGNOSTIC_CHANNEL=1
PULSE_RUNTIME_PATH=/var/run/pulse
HOSTNAME=kasm
LANGUAGE=en_US:en
SDL_GAMECONTROLLERCONFIG=030000005e040000be02000014010000,XInput Controller,platform:Linux,a:b0,b:b1,x:b2,y:b3,back:b8,guide:b16,start:b9,leftstick:b10,rightstick:b11,leftshoulder:b4,rightshoulder:b5,dpup:b12,dpdown:b13,dpleft:b14,dpright:b15,leftx:a0,lefty:a1,rightx:a2,righty:a3,lefttrigger:b6,righttrigger:b7
KASM_SVC_SEND_CUT_TEXT=-SendCutText 1
DISTRO=ubuntu
INST_DIR=/dockerstartup/install
SSH_AUTH_SOCK=/tmp/ssh-XXXXXXhJcNRz/agent.146
ELECTRON_RUN_AS_NODE=1
START_PULSEAUDIO=1
DESKTOP_SESSION=xfce
SSH_AGENT_PID=150
KASM_SVC_AUDIO_INPUT=1
NO_AT_BRIDGE=1
VSCODE_AMD_ENTRYPOINT=vs/workbench/api/node/extensionHostProcess
KASM_SVC_AUDIO=1
PWD=/home/kasm-user/vscode/GavinCopley.github.io/_notebooks
VNC_RESOLUTION=1366x612
KASM_ID=8884907a-ee46-4d17-9325-6ea81e93dffb
NVIDIA_DRIVER_CAPABILITIES=graphics,compat32,utility
PYDEVD_IPYTHON_COMPATIBLE_DEBUGGING=1
VSCODE_CODE_CACHE_PATH=/home/kasm-user/.config/Code/CachedData/6c3e3dba23e8fadc360aed75ce363ba185c49794
KASM_SVC_DOWNLOADS=1
OMP_WAIT_POLICY=PASSIVE
HOME=/home/kasm-user
LANG=en_US.UTF-8
XDG_CURRENT_DESKTOP=XFCE
AUDIO_PORT=4901
VSCODE_IPC_HOOK=/home/kasm-user/.config/Code/1.81-main.sock
DONT_PROMPT_WSL_INSTALL=No_Prompt_please
STARTUPDIR=/dockerstartup
CLICOLOR=1
VSCODE_L10N_BUNDLE_LOCATION=
PROXYPATH=f5262684-abd7-43/b43159c2-f50f-4a7b-8593-511b1b797c0f
SKIP_CLEAN=true
CHROME_DESKTOP=code-url-handler.desktop
KASM_SVC_GAMEPAD=0
GEM_HOME=/home/kasm-user/gems
TERM=xterm-color
GOMP_SPINCOUNT=0
GIT_PAGER=cat
KASMVNC_AUTO_RECOVER=true
VNC_COL_DEPTH=24
KASM_SVC_UPLOADS=1
PYTHONIOENCODING=utf-8
START_XFCE4=1
DISPLAY=:1.0
VSCODE_PID=271
SHLVL=1
PAGER=cat
MAX_FRAME_RATE=24
VSCODE_CWD=/home/kasm-user
KASM_VNC_PATH=/usr/share/kasmvnc
MPLBACKEND=module://matplotlib_inline.backend_inline
KASM_RX_HOME=/dockerstartup/kasmrx
LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu:/usr/lib/i386-linux-gnu:/opt/libjpeg-turbo/lib64/:/usr/local/lib/:/usr/local/nvidia/lib:/usr/local/nvidia/lib64
VSCODE_CRASH_REPORTER_PROCESS_TYPE=extensionHost
LC_ALL=en_US.UTF-8
KASM_SVC_ACCEPT_CUT_TEXT=-AcceptCutText 1
INST_SCRIPTS=/ubuntu/install/tools/install_tools.sh                   /ubuntu/install/chrome/install_chrome.sh                   /ubuntu/install/chromium/install_chromium.sh                   /ubuntu/install/sublime_text/install_sublime_text.sh                   /ubuntu/install/slack/install_slack.sh                   /ubuntu/install/vs_code/install_vs_code.sh                   /ubuntu/install/cleanup/cleanup.sh
XDG_DATA_DIRS=/usr/local/share:/usr/share
GDK_BACKEND=x11
VNC_PORT=5901
PATH=/bin:/home/kasm-user/.local/bin:/home/kasm-user/gems/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/kasm-user/gems/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
NO_VNC_PORT=6901
ORIGINAL_XDG_CURRENT_DESKTOP=XFCE
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-tpBuyQLD2H,guid=00a96b1ff2fa2ff470d1d02664f8cf27
VSCODE_NLS_CONFIG={"locale":"en-us","osLocale":"en-us","availableLanguages":{},"_languagePackSupport":true}
DEBIAN_FRONTEND=noninteractive
VSCODE_HANDLES_UNCAUGHT_ERRORS=true
_=/bin/env

%%script bash

# Extract saved variables
source /tmp/variables.sh

cd $project

echo ""
echo "show the secrets of .git"
cd .git
ls -l

echo ""
echo "look at config file"
cat config

show the secrets of .git
total 64
drwxr-xr-x 2 kasm-user kasm-user  4096 Aug 18 19:31 branches
-rw-r--r-- 1 kasm-user kasm-user   267 Aug 18 19:31 config
-rw-r--r-- 1 kasm-user kasm-user    73 Aug 18 19:31 description
-rw-r--r-- 1 kasm-user kasm-user   102 Sep  5 18:21 FETCH_HEAD
-rw-r--r-- 1 kasm-user kasm-user    21 Aug 18 19:31 HEAD
drwxr-xr-x 2 kasm-user kasm-user  4096 Aug 18 19:31 hooks
-rw-r--r-- 1 kasm-user kasm-user 15323 Sep  5 18:21 index
drwxr-xr-x 2 kasm-user kasm-user  4096 Aug 18 19:31 info
drwxr-xr-x 3 kasm-user kasm-user  4096 Aug 18 19:31 logs
drwxr-xr-x 4 kasm-user kasm-user  4096 Sep  5 18:21 objects
-rw-r--r-- 1 kasm-user kasm-user    41 Sep  5 18:21 ORIG_HEAD
-rw-r--r-- 1 kasm-user kasm-user   112 Aug 18 19:31 packed-refs
drwxr-xr-x 5 kasm-user kasm-user  4096 Aug 18 19:31 refs

look at config file
[core]
	repositoryformatversion = 0
	filemode = true
	bare = false
	logallrefupdates = true
[remote "origin"]
	url = https://github.com/nighthawkcoders/teacher.git
	fetch = +refs/heads/*:refs/remotes/origin/*
[branch "main"]
	remote = origin
	merge = refs/heads/main

Advanced Student Request - Make a file in Bash

This example was requested by a student (Jun Lim, CSA). The request was to make jupyer file using bash, I adapted the request to markdown. This type of thought will have great extrapolation to coding and possibilities of using List, Arrays, or APIs to build user interfaces. JavaScript is a language where building HTML is very common.

To get more interesting output from terminal, this will require using something like mdless (https://github.com/ttscoff/mdless). This enables see markdown in rendered format.

• On Desktop Install PKG from MacPorts
• In Terminal on MacOS
  • Install ncurses
  • gem install mdless

Output of the example is much nicer in “jupyter”

%%script bash

# This example has error in VSCode, it run best on Jupyter
cd /tmp

file="sample.md"
if [ -f "$file" ]; then
    rm $file
fi

tee -a $file >/dev/null <<EOF
# Show Generated Markdown
This introductory paragraph and this line and the title above are generated using tee with the standard input (<<) redirection operator.
- This bulleted element is still part of the tee body.
EOF

echo "- This bulleted element and lines below are generated using echo with standard output (>>) redirection operator." >> $file
echo "- The list definition, as is, is using space to seperate lines.  Thus the use of commas and hyphens in output." >> $file
actions=("ls,list-directory" "cd,change-directory" "pwd,present-working-directory" "if-then-fi,test-condition" "env,bash-environment-variables" "cat,view-file-contents" "tee,write-to-output" "echo,display-content-of-string" "echo_text_>\$file,write-content-to-file" "echo_text_>>\$file,append-content-to-file")
for action in ${actions[@]}; do  # for loop is very similar to other language, though [@], semi-colon, do are new
  action=${action//-/ }  # convert dash to space
  action=${action//,/: } # convert comma to colon
  action=${action//_text_/ \"sample text\" } # convert _text_ to sample text, note escape character \ to avoid "" having meaning
  echo "    - ${action//-/ }" >> $file  # echo is redirected to file with >>
done

echo ""
echo "File listing and status"
ls -l $file # list file
wc $file   # show words
mdless $file  # this requires installation, but renders markown from terminal

rm $file  # clean up termporary file

File listing and status
-rw-r--r-- 1 kasm-user kasm-user 809 Sep  6 20:03 sample.md
 15 132 809 sample.md


bash: line 30: mdless: command not found

Hack Preparation.

Review Tool Setup Procedures and think about some thing you could verify through a Shell notebook.

• Come up with your own student view of this procedure to show your tools are installed. It is best that you keep the few things you understand, add things later as you start to understand them.
• Name and create blog notes on some Linux commands you will use frequently.
• Is there anything we use to verify tools we installed? Review versions? We can verify tools we installed if everything works and we can check versions with -v
• How would you update a repository? Use the git command line? To update a repository I need to do git push to push mu local version to the Github version. I can also do git pull to pull the github version to my local machine.