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Claude Code

Anthropic's Official AI Coding Assistant CLI

Claude Code is an AI-powered coding assistant that runs directly in your terminal. It supports code writing, debugging, refactoring, documentation, and various development tasks.

CLI Tool AI Assistant Code Generation

🚀 Quick Start

# Install

npm install -g @anthropic-ai/claude-code

# Start

claude

💻 CLI Options

Command	Description
`claude`	Start interactive REPL session
`claude "query"`	Start with initial prompt
`claude -p "query"`	Non-interactive mode (print and exit)
`claude -c`	Continue last conversation
`claude -r "sessionID"`	Resume specific session
`claude --model opus`	Use specific model (opus, sonnet, haiku)
`claude --verbose`	Enable verbose logging
`claude --dangerously-skip-permissions`	Skip permission prompts (use with caution)

/ Slash Commands

Session Management

/clear Clear conversation and start fresh

/compact Summarize context to save tokens

/memory Edit CLAUDE.md memory file

/model Change AI model

System & Help

/help Show available commands

/config View and modify settings

/cost Check token usage and cost

/doctor Diagnose installation status

Development Tools

/review Review current changes

/pr-comments View GitHub PR comments

/init Initialize CLAUDE.md in project

Configuration

/login Login to Anthropic account

/logout Logout from account

/vim Toggle Vim keybindings

⌨️ Keyboard Shortcuts

Cancel operation Ctrl + C

Exit session Ctrl + D

Clear screen Ctrl + L

Previous prompt ↑

Next prompt ↓

Autocomplete path Tab

Cancel input Esc

Multi-line input \

🔧 Available Tools

Built-in tools that Claude Code uses automatically.

📖 Read

Read file contents. Supports images, PDFs, Jupyter notebooks

✏️ Write

Create new files or overwrite existing ones

🔄 Edit

Modify specific parts of existing files (string replacement)

💻 Bash

Execute shell commands (git, npm, docker, etc.)

🔍 Glob

Find files by pattern (e.g., **/*.ts)

🔎 Grep

Search file contents with regex

🌐 WebFetch

Fetch web content from URLs

🔗 WebSearch

Perform web searches

📋 Task

Launch sub-agents for complex tasks

✅ TodoWrite

Create and track task lists

📝 CLAUDE.md Configuration

Create a CLAUDE.md file in your project root. Claude automatically reads it for context.

# Project Overview
This is a React + TypeScript web application.

# Tech Stack
- React 18
- TypeScript 5
- Tailwind CSS
- Vite

# Coding Conventions
- Use functional components
- Commit messages follow Conventional Commits
- Test files use .test.ts extension

# Important Directories
- src/components: Reusable components
- src/hooks: Custom hooks
- src/utils: Utility functions

📥 Pipe Input Examples

Pass file contents or command output to Claude via standard input.

# Analyze error logs

cat error.log | claude -p "Explain this error and how to fix it"

# Code review

git diff | claude -p "Review these changes"

# Analyze dependencies

cat package.json | claude -p "Analyze the dependencies in this project"

# Analyze test failures

npm test 2>&1 | claude -p "Analyze the failing tests"

💡 Real-World Use Cases

🐛 Bug Fixing

"Fix the TypeError in this function"

✨ Feature Development

"Add user authentication functionality"

🔄 Refactoring

"Convert this class to a functional component"

📚 Documentation

"Add JSDoc comments to this API module"

🧪 Testing

"Write unit tests for this utility function"

🔍 Code Analysis

"Explain the structure of this codebase"

⭐ Pro Tips

▸ Use @filename to reference files directly in your prompts.
▸ Drag & drop images or paste from clipboard for visual context.
▸ Use .claudeignore to exclude specific files/folders.
▸ Use /compact to summarize context and save tokens in long conversations.
▸ Use claude -c to continue your last conversation.
▸ Break large tasks into smaller steps for better results.

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