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Linux Shell and Bash • 65 min read

Description

A Tech Talk on Linux and the Bash shell.

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

bash: fg: %%script: no such job

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"

bash: fg: %%script: no such job
Project dir: /Users/matidanish/vscode
Project: /Users/matidanish/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." 

bash: fg: %%script: no such job
Using conditional statement to create a project directory and project
Directory /Users/matidanish/vscode exists.
Directory /Users/matidanish/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


bash: fg: %%script: no such job
Navigate to project, then navigate to area wwhere files were cloned
/Users/matidanish/vscode/teacher

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

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

bash: fg: %%script: no such job
Navigate to project, then navigate to area wwhere files were cloned
/Users/matidanish/vscode/teacher

list all files in long format
total 104
drwxr-xr-x@ 23 matidanish  staff   736 Aug 21 11:27 .
drwxr-xr-x@  8 matidanish  staff   256 Aug 31 20:27 ..
drwxr-xr-x@ 13 matidanish  staff   416 Aug 21 11:27 .git
drwxr-xr-x@  3 matidanish  staff    96 Aug 21 11:27 .github
-rw-r--r--@  1 matidanish  staff   157 Aug 21 11:27 .gitignore
-rw-r--r--@  1 matidanish  staff   122 Aug 21 11:27 Gemfile
-rw-r--r--@  1 matidanish  staff  1081 Aug 21 11:27 LICENSE
-rw-r--r--@  1 matidanish  staff  3131 Aug 21 11:27 Makefile
-rw-r--r--@  1 matidanish  staff  6853 Aug 21 11:27 README.md
-rw-r--r--@  1 matidanish  staff   607 Aug 21 11:27 _config.yml
drwxr-xr-x@  6 matidanish  staff   192 Aug 21 11:27 _data
drwxr-xr-x@ 11 matidanish  staff   352 Aug 21 11:27 _includes
drwxr-xr-x@  6 matidanish  staff   192 Aug 21 11:27 _layouts
drwxr-xr-x@ 39 matidanish  staff  1248 Aug 25 11:46 _notebooks
drwxr-xr-x@ 12 matidanish  staff   384 Aug 21 11:27 _posts
drwxr-xr-x@  4 matidanish  staff   128 Aug 21 11:27 assets
-rw-r--r--@  1 matidanish  staff    92 Aug 21 11:27 csa.md
-rw-r--r--@  1 matidanish  staff    98 Aug 21 11:27 csp.md
-rw-r--r--@  1 matidanish  staff   108 Aug 21 11:27 csse.md
drwxr-xr-x@ 34 matidanish  staff  1088 Aug 21 11:27 images
-rw-r--r--@  1 matidanish  staff  5149 Aug 21 11:27 index.md
-rw-r--r--@  1 matidanish  staff    53 Aug 21 11:27 indexBlogs.md
drwxr-xr-x@  8 matidanish  staff   256 Aug 21 11:27 scripts

%%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

bash: fg: %%script: no such job
Look for posts
/Users/matidanish/vscode/teacher/_posts
total 176
-rw-r--r--@ 1 matidanish  staff   7685 Aug 21 11:27 2023-08-16-Tools_Equipment.md
-rw-r--r--@ 1 matidanish  staff   4650 Aug 21 11:27 2023-08-16-pair_programming.md
-rw-r--r--@ 1 matidanish  staff   7137 Aug 21 11:27 2023-08-17-markdown-html_fragments.md
-rw-r--r--@ 1 matidanish  staff   6659 Aug 21 11:27 2023-08-23-javascript-calculator.md
-rw-r--r--@ 1 matidanish  staff  10642 Aug 21 11:27 2023-08-30-agile_methodolgy.md
-rw-r--r--@ 1 matidanish  staff   3849 Aug 21 11:27 2023-08-30-javascript-music-api.md
-rw-r--r--@ 1 matidanish  staff   5312 Aug 21 11:27 2023-09-06-javascript-motion-mario-oop.md
-rw-r--r--@ 1 matidanish  staff   4812 Aug 21 11:27 2023-09-13-java-free_response.md
-rw-r--r--@ 1 matidanish  staff  13220 Aug 21 11:27 2023-10-16-java-api-pojo-jpa.md
-rw-r--r--@ 1 matidanish  staff   6819 Aug 21 11:27 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

bash: fg: %%script: no such job
Look for notebooks
/Users/matidanish/vscode/teacher/_notebooks
total 1472
-rw-r--r--@ 1 matidanish  staff   13014 Aug 21 11:27 2023-08-01-cloud_database.ipynb
-rw-r--r--@ 1 matidanish  staff    8992 Aug 21 11:27 2023-08-01-mario_player.ipynb
-rw-r--r--@ 1 matidanish  staff   43705 Aug 21 11:27 2023-08-02-cloud-workspace-automation.ipynb
-rw-r--r--@ 1 matidanish  staff   22060 Aug 21 11:27 2023-08-03-mario_block.ipynb
-rw-r--r--@ 1 matidanish  staff   11791 Aug 21 11:27 2023-08-03-mario_platform.ipynb
-rw-r--r--@ 1 matidanish  staff   19450 Aug 21 11:27 2023-08-03-mario_tube.ipynb
-rw-r--r--@ 1 matidanish  staff   24387 Aug 21 11:27 2023-08-04-mario_background.ipynb
-rw-r--r--@ 1 matidanish  staff    3496 Aug 21 11:27 2023-08-07-mario_lesson.ipynb
-rw-r--r--@ 1 matidanish  staff   10337 Aug 25 11:44 2023-08-15-java-hello.ipynb
-rw-r--r--@ 1 matidanish  staff   25624 Aug 21 11:27 2023-08-16-github_pages_setup.ipynb
-rw-r--r--@ 1 matidanish  staff   16156 Aug 21 11:27 2023-08-16-linux_shell.ipynb
-rw-r--r--@ 1 matidanish  staff   11466 Aug 21 11:27 2023-08-16-python_hello.ipynb
-rw-r--r--@ 1 matidanish  staff    9425 Aug 21 11:27 2023-08-23-github_pages_anatomy.ipynb
-rw-r--r--@ 1 matidanish  staff   23793 Aug 25 11:46 2023-08-23-java-console_games.ipynb
-rw-r--r--@ 1 matidanish  staff    9038 Aug 21 11:27 2023-08-23-python_tricks.ipynb
-rw-r--r--@ 1 matidanish  staff   10152 Aug 21 11:27 2023-08-30-javascript_top_10.ipynb
-rw-r--r--@ 1 matidanish  staff    9689 Aug 21 11:27 2023-08-30-showcase-S1-pair.ipynb
-rw-r--r--@ 1 matidanish  staff    7192 Aug 21 11:27 2023-09-05-python-flask-anatomy.ipynb
-rw-r--r--@ 1 matidanish  staff   22157 Aug 21 11:27 2023-09-06-AWS-deployment.ipynb
-rw-r--r--@ 1 matidanish  staff   14380 Aug 21 11:27 2023-09-06-java-primitives.ipynb
-rw-r--r--@ 1 matidanish  staff   11671 Aug 21 11:27 2023-09-06-javascript-input.ipynb
-rw-r--r--@ 1 matidanish  staff   13706 Aug 21 11:27 2023-09-12-java_menu_class.ipynb
-rw-r--r--@ 1 matidanish  staff    9562 Aug 21 11:27 2023-09-13-java_fibonaccii_class.ipynb
-rw-r--r--@ 1 matidanish  staff   44217 Aug 21 11:27 2023-09-13-javascript_output.ipynb
-rw-r--r--@ 1 matidanish  staff   43423 Aug 21 11:27 2023-09-13-python-pandas_intro.ipynb
-rw-r--r--@ 1 matidanish  staff   11578 Aug 21 11:27 2023-09-20-java-image_2D.ipynb
-rw-r--r--@ 1 matidanish  staff   26739 Aug 21 11:27 2023-09-20-javascript_motion_dog.ipynb
-rw-r--r--@ 1 matidanish  staff   13599 Aug 21 11:27 2023-10-02-java-spring-anatomy.ipynb
-rw-r--r--@ 1 matidanish  staff   12429 Aug 21 11:27 2023-10-09-java-chatgpt.ipynb
-rw-r--r--@ 1 matidanish  staff   15632 Aug 21 11:27 2023-10-09-javascript_api.ipynb
-rw-r--r--@ 1 matidanish  staff  113091 Aug 21 11:27 2023-10-09-python_machine_learing_fitness.ipynb
-rw-r--r--@ 1 matidanish  staff   16271 Aug 21 11:27 2023-11-13-jwt-python-flask.ipynb
-rw-r--r--@ 1 matidanish  staff   15951 Aug 21 11:27 2023-11-13-vulnerabilities.ipynb
-rw-r--r--@ 1 matidanish  staff   18328 Aug 21 11:27 2023-11-20-jwt-java-spring-challenge.md
-rw-r--r--@ 1 matidanish  staff   10745 Aug 21 11:27 2024-01-04-cockpit-setup.ipynb
drwxr-xr-x@ 3 matidanish  staff      96 Aug 21 11:27 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

bash: fg: %%script: no such job
Look for images in notebooks, print working directory, list files
bash: cd: /Users/matidanish/vscode/teacher/_notebooks/images: No such file or directory
/Users/matidanish/vscode/teacher/_notebooks
total 1472
-rw-r--r--@ 1 matidanish  staff   13014 Aug 21 11:27 2023-08-01-cloud_database.ipynb
-rw-r--r--@ 1 matidanish  staff    8992 Aug 21 11:27 2023-08-01-mario_player.ipynb
-rw-r--r--@ 1 matidanish  staff   43705 Aug 21 11:27 2023-08-02-cloud-workspace-automation.ipynb
-rw-r--r--@ 1 matidanish  staff   22060 Aug 21 11:27 2023-08-03-mario_block.ipynb
-rw-r--r--@ 1 matidanish  staff   11791 Aug 21 11:27 2023-08-03-mario_platform.ipynb
-rw-r--r--@ 1 matidanish  staff   19450 Aug 21 11:27 2023-08-03-mario_tube.ipynb
-rw-r--r--@ 1 matidanish  staff   24387 Aug 21 11:27 2023-08-04-mario_background.ipynb
-rw-r--r--@ 1 matidanish  staff    3496 Aug 21 11:27 2023-08-07-mario_lesson.ipynb
-rw-r--r--@ 1 matidanish  staff   10337 Aug 25 11:44 2023-08-15-java-hello.ipynb
-rw-r--r--@ 1 matidanish  staff   25624 Aug 21 11:27 2023-08-16-github_pages_setup.ipynb
-rw-r--r--@ 1 matidanish  staff   16156 Aug 21 11:27 2023-08-16-linux_shell.ipynb
-rw-r--r--@ 1 matidanish  staff   11466 Aug 21 11:27 2023-08-16-python_hello.ipynb
-rw-r--r--@ 1 matidanish  staff    9425 Aug 21 11:27 2023-08-23-github_pages_anatomy.ipynb
-rw-r--r--@ 1 matidanish  staff   23793 Aug 25 11:46 2023-08-23-java-console_games.ipynb
-rw-r--r--@ 1 matidanish  staff    9038 Aug 21 11:27 2023-08-23-python_tricks.ipynb
-rw-r--r--@ 1 matidanish  staff   10152 Aug 21 11:27 2023-08-30-javascript_top_10.ipynb
-rw-r--r--@ 1 matidanish  staff    9689 Aug 21 11:27 2023-08-30-showcase-S1-pair.ipynb
-rw-r--r--@ 1 matidanish  staff    7192 Aug 21 11:27 2023-09-05-python-flask-anatomy.ipynb
-rw-r--r--@ 1 matidanish  staff   22157 Aug 21 11:27 2023-09-06-AWS-deployment.ipynb
-rw-r--r--@ 1 matidanish  staff   14380 Aug 21 11:27 2023-09-06-java-primitives.ipynb
-rw-r--r--@ 1 matidanish  staff   11671 Aug 21 11:27 2023-09-06-javascript-input.ipynb
-rw-r--r--@ 1 matidanish  staff   13706 Aug 21 11:27 2023-09-12-java_menu_class.ipynb
-rw-r--r--@ 1 matidanish  staff    9562 Aug 21 11:27 2023-09-13-java_fibonaccii_class.ipynb
-rw-r--r--@ 1 matidanish  staff   44217 Aug 21 11:27 2023-09-13-javascript_output.ipynb
-rw-r--r--@ 1 matidanish  staff   43423 Aug 21 11:27 2023-09-13-python-pandas_intro.ipynb
-rw-r--r--@ 1 matidanish  staff   11578 Aug 21 11:27 2023-09-20-java-image_2D.ipynb
-rw-r--r--@ 1 matidanish  staff   26739 Aug 21 11:27 2023-09-20-javascript_motion_dog.ipynb
-rw-r--r--@ 1 matidanish  staff   13599 Aug 21 11:27 2023-10-02-java-spring-anatomy.ipynb
-rw-r--r--@ 1 matidanish  staff   12429 Aug 21 11:27 2023-10-09-java-chatgpt.ipynb
-rw-r--r--@ 1 matidanish  staff   15632 Aug 21 11:27 2023-10-09-javascript_api.ipynb
-rw-r--r--@ 1 matidanish  staff  113091 Aug 21 11:27 2023-10-09-python_machine_learing_fitness.ipynb
-rw-r--r--@ 1 matidanish  staff   16271 Aug 21 11:27 2023-11-13-jwt-python-flask.ipynb
-rw-r--r--@ 1 matidanish  staff   15951 Aug 21 11:27 2023-11-13-vulnerabilities.ipynb
-rw-r--r--@ 1 matidanish  staff   18328 Aug 21 11:27 2023-11-20-jwt-java-spring-challenge.md
-rw-r--r--@ 1 matidanish  staff   10745 Aug 21 11:27 2024-01-04-cockpit-setup.ipynb
drwxr-xr-x@ 3 matidanish  staff      96 Aug 21 11:27 files

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"


bash: fg: %%script: no such job
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

bash: fg: %%script: no such job
Show the shell environment variables, key on left of equal value on right

STARSHIP_SHELL=zsh
MANPATH=/opt/homebrew/share/man::
NIX_PROFILES=/nix/var/nix/profiles/default /Users/matidanish/.nix-profile
TERM=alacritty
SHELL=/bin/zsh
HOMEBREW_REPOSITORY=/opt/homebrew
TMPDIR=/var/folders/w6/pbv8_krn77545c591n8wczj40000gn/T/
LIBRARY_PATH=/opt/homebrew/lib:
CONDA_SHLVL=1
CONDA_PROMPT_MODIFIER=
WINDOWID=5461217584
OLDPWD=/Users/matidanish/vscode/teacher/_notebooks
PYDEVD_USE_FRAME_EVAL=NO
ZSH=/Users/matidanish/.oh-my-zsh
LC_ALL=en_US.UTF-8
USER=matidanish
LS_COLORS=di=1;36:ln=35:so=32:pi=33:ex=31:bd=34;46:cd=34;43:su=30;41:sg=30;46:tw=30;42:ow=30;43
COMMAND_MODE=unix2003
ALACRITTY_SOCKET=/var/folders/w6/pbv8_krn77545c591n8wczj40000gn/T/Alacritty-7396.sock
CONDA_EXE=/opt/homebrew/Caskroom/miniconda/base/bin/conda
SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.RIu5SFr5Ws/Listeners
ALACRITTY_LOG=/var/folders/w6/pbv8_krn77545c591n8wczj40000gn/T/Alacritty-7396.log
__CF_USER_TEXT_ENCODING=0x1F5:0x0:0x0
JPY_PARENT_PID=9322
ATUIN_HISTORY=atuin history list
PAGER=cat
_CE_CONDA=
LSCOLORS=Gxfxcxdxbxegedabagacad
PATH=/Users/matidanish/.nix-profile/bin:/nix/var/nix/profiles/default/bin:/Users/matidanish/.rbenv/shims:/opt/homebrew/Caskroom/miniconda/base/bin:/opt/homebrew/Caskroom/miniconda/base/condabin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
CONDA_PREFIX=/opt/homebrew/Caskroom/miniconda/base
__CFBundleIdentifier=org.alacritty
PWD=/Users/matidanish/vscode/teacher
notebooks=/Users/matidanish/vscode/teacher/_notebooks
project_repo=https://github.com/nighthawkcoders/teacher.git
project=/Users/matidanish/vscode/teacher
project_dir=/Users/matidanish/vscode
XPC_FLAGS=0x0
NIX_SSL_CERT_FILE=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
PS1=PROMPT_IJHMPNFRNXPC\[\]>
RBENV_SHELL=zsh
_CE_M=
XPC_SERVICE_NAME=0
SHLVL=2
HOME=/Users/matidanish
ATUIN_HISTORY_ID=018a4f591e697f07a1af8e9fc4901c0c
HOMEBREW_PREFIX=/opt/homebrew
STARSHIP_SESSION_KEY=3485297362842421
CONDA_PYTHON_EXE=/opt/homebrew/Caskroom/miniconda/base/bin/python
LESS=-R
LOGNAME=matidanish
ATUIN_SESSION=018a4f123a42770b9d9cb6de14416856
ALACRITTY_WINDOW_ID=5461217584
CONDA_DEFAULT_ENV=base
posts=/Users/matidanish/vscode/teacher/_posts
INFOPATH=/opt/homebrew/share/info:
HOMEBREW_CELLAR=/opt/homebrew/Cellar
NOTEBOOK_BASH_KERNEL_CAPABILITIES=image,html,javascript
COLORTERM=truecolor
_=/usr/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

bash: fg: %%script: no such job

show the secrets of .git
total 64
-rw-r--r--@  1 matidanish  staff    102 Aug 31 23:03 FETCH_HEAD
-rw-r--r--@  1 matidanish  staff     21 Aug 21 11:27 HEAD
-rw-r--r--@  1 matidanish  staff    312 Aug 21 11:27 config
-rw-r--r--@  1 matidanish  staff     73 Aug 21 11:27 description
drwxr-xr-x@ 16 matidanish  staff    512 Aug 21 11:27 hooks
-rw-r--r--@  1 matidanish  staff  11702 Aug 21 11:27 index
drwxr-xr-x@  3 matidanish  staff     96 Aug 21 11:27 info
drwxr-xr-x@  4 matidanish  staff    128 Aug 21 11:27 logs
drwxr-xr-x@ 86 matidanish  staff   2752 Aug 31 23:03 objects
-rw-r--r--@  1 matidanish  staff    112 Aug 21 11:27 packed-refs
drwxr-xr-x@  5 matidanish  staff    160 Aug 21 11:27 refs

look at config file
[core]
	repositoryformatversion = 0
	filemode = true
	bare = false
	logallrefupdates = true
	ignorecase = true
	precomposeunicode = 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.

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

bash: fg: %%script: no such job

File listing and status
-rw-r--r--@ 1 matidanish  wheel  809 Aug 31 23:06 sample.md
      15     132     809 sample.md
bash: 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?
  • How would you update a repository? Use the git command line?

COmmands that i use frequently

  • ls
  • cd (file)
  • cd ..
  • jupyter notebook .
  • code .
  • git commit -a m “"
  • git push
  • git push –force
  • git pull
  • wget
  • make
  • bundle exec jekyll serve

to update tools and review versions

to update a tool you can use pip or if you are on mac you can use the command: “brew update && brew upgrade”

to check the version of the tool that you have do: “ --version"

updating repo’s

to update a repo on your computer, use “git pull”

to update a repo on github, use:

  • git commit -a m “"
  • git push