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Command Shell

Overview

This Python-based Command Shell is a simple CLI (Command Line Interface) application that mimics basic functionalities of a typical shell. It allows users to navigate directories, list contents, execute external commands, and customize the shell prompt.

Features

  • Change directory (cd)
  • List directory contents (ls)
  • Execute external commands
  • Exit the shell (exit)
  • Customize the shell prompt (prompt)

Requirements

  • Python 3.x

Installation

  1. Ensure you have Python 3.x installed on your system.
  2. Download or clone the shell script to your local machine.

How to Use

  1. Open your terminal or command prompt.
  2. Navigate to the directory where the script is located.
  3. Run the script using Python: 
    python shell.py

Commands

cd <directory>

  • Change the current working directory.
  • Example: 
    cd /path/to/directory

ls [directory]

  • List the contents of the specified directory. If no directory is specified, it lists the contents of the current directory.
  • Example: 
    ls /path/to/directory

exit

  • Exit the shell.

prompt <format>

  • Customize the shell prompt format.
  • Placeholders:
    • $PWD$: Current working directory
    • $HOME$: Home directory
  • Example: 
    prompt MyShell:$PWD$>

Executing External Commands

  • Any command not recognized as a built-in command will be executed as an external command using subprocess.run.
  • Example: 
    python --version

Output Screenshots

image

Test Cases:

image image

Developer Notes

  • The shell uses the os module for directory operations and the subprocess module to run external commands.
  • The self.prompt_format variable stores the format of the shell prompt, which can be customized using the prompt command.
  • The handle_command method parses user input and calls the appropriate method to handle the command.

Future Enhancements

  • Add support for more built-in commands.
  • Implement command history and autocomplete features.
  • Improve error handling and user feedback.

Enjoy using the Command Shell! If you encounter any issues or have suggestions for improvements, feel free to contribute or open an issue.