0-shell

A minimalist Unix-like shell implemented entirely in Rust, designed to run core Unix commands using low-level system operations rather than external binaries or existing shells.

Overview

0-shell is a lightweight, standalone shell designed for embedded Linux environments. All supported commands are implemented from scratch using Rust and system-level operations.

Features

Core Behavior

• Displays $ prompt

• Parses and executes commands synchronously

• Exits gracefully on Ctrl+D (EOF)

• Reports unknown commands with:

  Command '<name>' not found
  

Implemented Built-in Commands

Command	Description
echo	Print arguments
cd	Change directory
ls	List directory contents (-l, -a, -F)
pwd	Print current directory
cat	Output file contents
cp	Copy files
rm	Remove files/directories (-r)
mv	Move or rename files
mkdir	Create directories
exit	Exit the shell

Example Usage

student$ ./0-shell
$ cd dev
$ pwd
/dev
$ ls -l
...
$ something
Command 'something' not found
$ echo "Hello There"
Hello There
$ exit
student$

Learning Objectives

• File and directory system operations
• Shell loop I/O handling
• Robust syscall error handling
• Unix process and system API fundamentals

Build

cargo build --release

Run

./target/release/0-shell

Structure

src/
  main.rs
  commands/
  utils/