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  1. Overview

This document describes the architecture and design specifications for a bare-metal command shell implemented in Rust. The shell runs without a traditional operating system and provides interactive command execution, process management, text editing, and file I/O on top of a minimal kernel or hardware abstraction layer.

Shell ├── Console I/O │ ├── Input Driver │ ├── Output Driver │ ├── Device Abstraction │ └── Buffering │ ├── Canonical Text Editor │ ├── Line Buffer │ ├── History │ ├── Escape Characters │ ├── Cursor Control │ └── Editing Commands │ ├── Command System │ ├── Parser │ │ ├── Lexer │ │ ├── AST Builder │ │ └── Syntax Validator │ ├── Command Registry │ ├── Built-ins │ ├── Pipe │ │ ├── Pipe Buffer │ │ ├── Stream Connector │ │ └── Backpressure Handling │ └── IPC │ ├── Message Passing │ ├── Shared Memory │ └── Synchronization │ ├── Process Management │ ├── Fork │ │ ├── exec │ │ └── Process │ │ ├── PID │ │ ├── Address Space │ │ ├── Threads │ │ ├── File Descriptors │ │ ├── Environment │ │ └── State │ ├── Scheduler Interface │ └── Signals │ ├── File I/O │ ├── Virtual File System (VFS) │ ├── Read │ │ ├── Blocking Read │ │ ├── Non-Blocking Read │ │ └── Stream Read │ ├── Write │ │ ├── Buffered Write │ │ ├── Direct Write │ │ └── Flush Control │ ├── File Descriptors │ └── Mount System │ └── System Services ├── Memory Management ├── Allocator ├── Time / Clock ├── Logging └── Error Handling