Build Your Own Shell - Java Solution

This repository contains my solution for the "Build Your Own Shell" Challenge.

Overview

In this challenge, I built a POSIX-compliant shell capable of interpreting shell commands, running external programs, and handling builtin commands like cd, pwd, echo, and more. Along the way, I learned about shell command parsing, REPLs, and the implementation of builtin commands.

Core Shell Implementation

The base stages required building the core of the shell to support basic commands and functionality.

Features Implemented

I have successfully completed the implementation of the core functionality of the shell across multiple stages. This includes:

1. Command Parsing:

   • Parses and interprets user input effectively, supporting arguments and options.

2. Builtin Commands:

   • exit: Exit the shell with a specified status code.
   • echo: Print text to the terminal.
   • type: Identify commands as built-in or external.
   • pwd: Displays the current working directory.
   • cd: Supports navigation using:-
     • Absolute paths, e.g., /usr/local/bin
     • Relative paths, e.g., ./, ../, ./dir
     • The ~ character, representing the user's home directory.

3. External Program Execution:

   • Runs programs located in directories specified by the PATH environment variable.

Usage Instructions

1. Clone the repository:

   git clone https://github.com/HackerKing5128/codecrafters-shell-java.git 

2. Navigate to the project directory:

   cd codecrafters-shell-java

3. Run the shell program:

   ./your_program.sh

4. Test with commands:
   • Try cd, pwd, echo Hello, or type ls

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You can view the entry point of the implementation in src/main/java/Main.java.