UNIX Shell

A simple version of UNIX Shell developed using Python and Pytest with awesome open-source technologies
Overview • Preview • Demo • Shell Commands • Technologies • File Structure • Setup • Tests • License

Overview

A simple version of UNIX Shell developed using Python programming language and Pytest framework, under a Linux environment, with several awesome open-source technologies. The shell can handle both built-in commands and executable files. It is not sophisticated as Bash or Zsh, but it performs similar functions.

The codebase is pretty organized, easier to maintain, and scalable as the project grows (if that happened) due to the clean file structure, clean code, and great documentation. This has been be done with modularity, best practices, documentation, documentation strings, type hinting, and unit testing, which made the codebase easier to debug and maintain, as well as, ensured code correctness.

Preview

Demo

Shell Commands

Command	Description
ls	Lists files and directories in the current location.
cd	Changes the current working directory.
pwd	Displays full pathname of the current working directory
mkdir	Creates a new directory.
touch	Creates an empty file or updates the timestamp of an existing file.
clear	Clears the terminal screen.
date	Displays the current date.
time	Displays the current time.
ps	Displays information about currently running processes.
echo	Prints text or variables to the terminal.
pid	Displays the shell Process ID (PID).
ppid	Displays the shell Parent Process ID (PPID).
info	Provides the project documentation.
help	Provides information and help about shell commands.
exit	Terminates the current shell session.
Executable Files	Executes executable files located in the current directory (./) or the parent directory (../).

Technologies

• Python 3.10
• PIP 22.0
• PyTest 8.2
• TermColor 2.4
• PyFIGlet 1.0
• TerminalTables 3.1

File Structure

This project is structured to facilitate the development and testing of various utilities. The architecture is organized into several directories and files, each serving a specific purpose. Below is a detailed breakdown of the project structure.

File Structure Contents

.
├── app.py
├── requirements.txt
├── requirements-dev.txt
├── LICENSE
├── README.md
├── .gitignore
├── utils/
├── tests/
└── .github/

Files Detailed Breakdown

• app.py file: Contains the main function which serves as the entry point of the application
• requirements.txt file: Lists the dependencies needed for the application to run in production
• requirements-dev.txt file: Lists the dependencies needed for development, such as testing frameworks and linters
• LICENSE file: Specifies the terms and conditions for using and distributing the software
• README.md file: Provides the project documentation
• .gitignore file: Specifies intentionally untracked files that Git should ignore

Directories Detailed Breakdown

• utils/ directory: Contains the implementation of various utilities
• tests/ directory: Contains unit tests for the modules in the utils directory
• .github/ directory: Contains files and directories that customize and enhance the GitHub repository's functionality and appearance

Setup

After cloning this repository, you should following this step-by-step instructions to setup the production environment and run the application locally on your machine.

I. Prerequisites

1. Update and upgrade packages.

   sudo apt update && sudo apt upgrade -y

2. Install Python 3.10 interpreter.

   sudo apt install python3.10

3. Install python3.10-venv package.

   sudo apt install python3.10-venv

II. Creating Virtual Environment

1. Navigate to the project's root directory.

2. Create a virtual environment.

   python3.10 -m venv .venv

3. Activate the virtual environment.

   source .venv/bin/activate

4. Install production dependencies.

   pip install -r requirements.txt

III. Running Shell Application

1. Make the app.py file executable.

   chmod +x app.py

2. Run the shell application.

   ./app.py

IV. Exiting Shell Application

1. Simply close the terminal window or use the exit command to exit the terminal session.

   exit

2. Deactivate the virtual environment.

   deactivate

Tests

This project uses Pytest for unit testing. Follow the steps below to run the tests.

1. Navigate to the project's root directory, and activate the virtual environment.

   source .venv/bin/activate

2. Install development dependencies.

   pip install -r requirements-dev.txt

3. Run Pytest with basic verbosity on details.

   pytest -v

4. After the tests finished, deactivate the virtual environment.

   deactivate

License

This project is licensed under the MIT License.