Chapter 1. Claude Code CLI Installation Guide

1.1 What is Claude Code CLI? A command-line tool that lets you direct an AI to write code using natural language, right from your terminal. It is a separate program from Claude.ai in the web browser, and is launched with the claude command after installation. 1.2 Prerequisites Item Requirement Operating System Windows 10+, Ubuntu 20.04+, macOS 10.15+ Account Claude Pro / Max / Teams / Enterprise (free plan not supported) Internet Required for installation and use RAM / Disk 4GB+ / 500MB+ Installation Method Comparison Method Node.js Auto-update Notes ① Native Not required ✅ ⭐ Officially recommended ② WinGet (Windows only) Not required ❌ Manual ③ npm 18+ required ❌ Manual ⛔ Deprecated 1.3 Windows PowerShell ① Native Installation (Recommended) Prerequisites — Install Git for Windows Claude Code uses Git Bash internally, so this is required. Download from https://git-scm.com → install with default settings Verify: git --version Installation irm https://claude.ai/install.ps1 | iex irm (dow