0-shell is a minimalist Unix-like shell implemented entirely in Rust, designed to execute core Unix commands using system calls only, without relying on external binaries or existing shells such as bash or sh.
Inspired by lightweight tools like BusyBox, this project focuses on understanding how a shell works internally while leveraging Rust’s safety guarantees to build a robust and maintainable system-level application.
The shell is intended to run in constrained or embedded Linux environments and faithfully reproduce essential Unix shell behavior.
You are a system-level developer tasked with building a standalone, lightweight shell for a Linux environment.
The objective is to recreate fundamental shell functionality, including command parsing, process execution, and file system interaction, without delegating work to external shell utilities.
This project emphasizes low-level system programming concepts while avoiding manual memory management through Rust’s abstractions.
By completing this project, you will:
- Understand Unix file and directory operations
- Manage user input and output in a shell loop
- Implement reliable and consistent error handling
- Work with Unix processes and system call APIs
- Apply Rust’s safety features in system-level programming
The shell must:
- Display a prompt (
$) and wait for user input - Parse and execute commands entered by the user
- Return to the prompt only after command execution completes
- Handle Ctrl+D (EOF) gracefully to exit the shell
- Print the following message for unknown commands:
Command '<name>' not found