Wish Shell 🐚

Wish Shell is a lightweight Unix-like shell implemented in C for fun!
It demonstrates how a basic command-line interpreter works, including parsing, process creation, execution, and I/O redirection.

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📌 Project Overview

Wish Shell is a simplified shell inspired by Unix shells such as bash and sh.

It supports:

• Command execution (ls, echo, cat, etc.)
• Built-in commands (e.g., cd, exit)
• Input/output redirection (only >)
• Background execution (&)
• Basic command parsing and tokenization
• Process creation using fork() and exec()

The goal of this project is to understand Linux process model, system calls, and shell internals.

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⚙️ Architecture

Wish Shell follows a classic shell execution pipeline:

User Input → Lexer → Parser → Executor → OS (fork/exec)

Key Components:

• Tokenizer: splits input into commands and arguments
• Parser: interprets redirection and background execution
• Executor: handles process creation and execution
• Process Manager: uses wait()/waitpid() for synchronization

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🚀 Build & Run

Compile

gcc -o wish wish.c -g -O0 -Wall

Run

./wish