Claude Code Cheat Sheet (Beta)

Quick Start

# Windows users
wsl
# Install Claude Code
npm install -g @anthropic-ai/claude-code
# Launch interactive REPL
claude
# Check version
claude --version

📚 Table of Contents

Pages

🟢 Level 1: Basic Commands

Installation & Getting Started

# Install Claude Code
curl -sL https://install.anthropic.com | sh
# Start interactive REPL
claude
# Start with initial prompt
claude "summarize this project"
# Check version
claude --version
# Update to latest version
claude update

Basic Navigation

/help # Show help and available commands
/exit # Exit the REPL
/clear # Clear conversation history
/config # Open config panel
/doctor # Check Claude Code installation health

Basic File Operations

# Print mode (SDK) - execute and exit
claude -p "explain this function"
# Process piped content
cat logs.txt | claude -p "explain"
# Continue most recent conversation
claude -c
# Continue via SDK
claude -c -p "Check for type errors"

Session Management

# Resume session by ID
claude -r "abc123" "Finish this PR"
# Resume with flag
claude --resume abc123 "query"
# Continue session
claude --continue

Keyboard Shortcuts

Ctrl+C # Cancel current operation
Ctrl+D # Exit Claude Code
Tab # Auto-complete
Up/Down # Navigate command history

🟡 Level 2: Intermediate Commands

Model Configuration

# Switch models
claude --model sonnet # Use Sonnet model
claude --model opus # Use Opus model
claude --model claude-sonnet-4-20250514 # Use specific model version

Directory Management

# Add additional working directories
claude --add-dir ../apps ../lib
# Validate directory paths
claude --add-dir /path/to/project

Output Formatting

# Different output formats
claude -p "query" --output-format json
claude -p "query" --output-format text
claude -p "query" --output-format stream-json
# Input formatting
claude -p --input-format stream-json

Session Control

# Limit conversation turns
claude -p --max-turns 3 "query"
# Verbose logging
claude --verbose
# Session cost and duration
/cos # Show total cost and duration

🟠 Level 3: Advanced Commands

Tool Management

# Allow specific tools without prompting
claude --allowedTools "Bash(git log:*)" "Bash(git diff:*)" "Write"
# Disallow specific tools
claude --disallowedTools "Bash(rm:*)" "Bash(sudo:*)"
# Prompt for specific tool permission
claude -p --permission-prompt-tool mcp_auth_tool "query"
# Skip all permission prompts (dangerous)
claude --dangerously-skip-permissions

Slash Commands - Session Management

/compact [instructions] # Summarize conversation with optional instructions
/clear # Reset conversation history and context
/exit # Exit the REPL
/help # Show available commands
/config # Open configuration panel

Slash Commands - System

/doctor # Check installation health
/cos # Show cost and duration of current session
/ide # Manage IDE integrations

🔴 Level 4: Expert Commands

Model Context Protocol (MCP)

# Configure MCP servers
claude --mcp
# MCP server management (via slash commands)
/mcp # Access MCP functionality

Advanced Piping

# Complex piping operations
git log --oneline | claude -p "summarize these commits"
cat error.log | claude -p "find the root cause"
ls -la | claude -p "explain this directory structure"

Programmatic Usage

# JSON output for scripting
claude -p "analyze code" --output-format json
# Stream JSON for real-time processing
claude -p "large task" --output-format stream-json
# Batch processing
claude -p --max-turns 1 "quick query"

🔵 Level 5: Power User Commands

Custom Slash Commands

# Create custom commands in .claude/commands/
# Example: .claude/commands/debug.md
/debug # Execute custom debug command
/test # Execute custom test command
/deploy # Execute custom deploy command

Complex Tool Combinations

# Advanced tool permissions
claude --allowedTools "Bash(git:*)" "Write" "Read" \
 --disallowedTools "Bash(rm:*)" "Bash(sudo:*)"
# Multiple directory access
claude --add-dir ../frontend ../backend ../shared

Performance Optimization

# Limit context for performance
claude -p --max-turns 5 "focused query"
# Clear context frequently
/clear # Use between tasks for better performance
# Compact conversations
/compact "keep only important parts"

🟣 Level 6: Master Commands

Advanced Configuration

# Complex model and tool configuration
claude --model claude-sonnet-4-20250514 \
 --add-dir ../apps ../lib ../tools \
 --allowedTools "Bash(git:*)" "Write" "Read" \
 --verbose \
 --output-format json

Automation Scripts

# Scripted Claude interactions
#!/bin/bash
claude -p "analyze codebase" --output-format json > analysis.json
claude -p "generate tests" --max-turns 3 --output-format text > tests.txt

Advanced Session Management

# Session ID management
SESSION_ID=$(claude -p "start analysis" --output-format json | jq -r '.session_id')
claude -r "$SESSION_ID" "continue analysis"

Complex Workflows

# Multi-step automation
claude -p "analyze project structure" | \
claude -p "suggest improvements" | \
claude -p "create implementation plan"

🟤 Level 7: Workflow Automation

Automated Code Review Workflows

# Automated PR review process
#!/bin/bash
git diff HEAD~1 | claude -p "review this PR for security issues" > security_review.md
git diff HEAD~1 | claude -p "check for performance issues" > performance_review.md
git diff HEAD~1 | claude -p "suggest improvements" > improvements.md

Continuous Integration Integration

# CI/CD pipeline integration
claude -p "analyze test coverage" --output-format json | jq '.coverage_percentage'
claude -p "generate release notes from commits" --max-turns 2 > RELEASE_NOTES.md

Batch Processing Workflows

# Process multiple files
find . -name "*.js" -exec claude -p "analyze this file for bugs: {}" \; > bug_report.txt
# Automated documentation generation
for file in src/*.py; do
 claude -p "generate docstring for $file" --output-format text >> docs.md
done

⚫ Level 8: Integration & Ecosystem

IDE Integration Commands

# VS Code integration
/ide vscode # Configure VS Code integration
/ide configure # Setup IDE configurations
# Custom IDE commands
claude --ide-mode "explain selected code"
claude --ide-mode "refactor this function"

Git Workflow Integration

# Git hooks integration
claude -p "create pre-commit hook for code quality" > .git/hooks/pre-commit
# Advanced Git operations
git log --oneline -10 | claude -p "create changelog from these commits"
git diff --name-only | claude -p "explain what changed in this commit"

Third-Party Tool Connections

# Database integration
mysql -e "SHOW TABLES" | claude -p "analyze database structure"
# Docker integration
docker ps | claude -p "analyze running containers"
docker logs container_name | claude -p "find errors in logs"

⚪ Level 9: Performance & Optimization

Memory & Resource Management

# Optimize memory usage
claude -p --max-turns 1 "quick analysis" # Single turn for efficiency
claude -p --compact-mode "analyze with minimal context"
# Resource monitoring
/cos # Check current session costs
/doctor --performance # Performance diagnostics

Caching & Optimization

# Efficient session reuse
claude -c "continue previous analysis" # Reuse existing context
claude --cache-results "repetitive task" # Cache common operations
# Parallel processing
claude -p "task 1" & claude -p "task 2" & wait # Parallel execution

Large-Scale Processing

# Handle large codebases efficiently
claude --add-dir . --max-context 50000 "analyze entire project"
claude --stream-output "process large dataset" | head -100

🔘 Level 10: Enterprise & Production

Team Collaboration

# Shared team configurations
claude --config-file team-config.json "standardized analysis"
# Team session sharing
claude -r "team-session-id" "continue team discussion"

Production Environment Setup

# Production-ready configuration
claude --production-mode \
 --security-enabled \
 --audit-logging \
 --max-turns 10 \
 "production analysis"

Enterprise Security

# Security-focused operations
claude --disallowedTools "Bash(rm:*)" "Bash(sudo:*)" "Bash(chmod:*)" \
 --audit-mode \
 --no-external-calls \
 "secure code review"

Monitoring & Compliance

# Audit and compliance
claude --audit-log /var/log/claude-audit.log "compliance check"
claude --compliance-mode "analyze for security compliance"

Command Reference Tables

CLI Commands

CLI Flags

Slash Commands

Keyboard Shortcut

Best Practices

Performance Tips

Security Tips

Workflow Tips

Best Practices by Level

Beginner Best Practices (Levels 1-3)

Intermediate Best Practices (Levels 4-6)

Advanced Best Practices (Levels 7-10)

Pro Tips & Tricks

Efficiency Tips

Security Pro Tips

Workflow Pro Tips

Troubleshooting Common Issues

Installation Issues

# Check installation
claude --version
claude /doctor
# Reinstall if needed
npm uninstall -g @anthropic-ai/claude-code
npm install -g @anthropic-ai/claude-code

Performance Issues

# Clear context for better performance
/clear
# Limit context size
claude -p --max-turns 3 "focused query"
# Use compact mode
/compact "keep only essentials"

Permission Issues

# Check current permissions
claude --list-permissions
# Reset permissions
claude --reset-permissions
# Configure specific permissions
claude --allowedTools "Bash(git:*)" --disallowedTools "Bash(rm:*)"

🤝 Contributing

Ways to Contribute

📄 License

⭐ Support

Resources & Further Learning