cli-reference

# CLI Reference Complete reference for Claude Code command-line interface. ## When to Use - "What CLI flags are available?" - "How do I use headless mode?" - "Claude in automation/CI/CD" - "Output format options" - "System prompt via CLI" - "How do I spawn agents properly?" ## Core Commands | Command | Description | Example | |---------|-------------|---------| | `claude` | Start interactive REPL | `claude` | | `claude "query"` | REPL with initial prompt | `claude "explain this project"` | | `claude -p "query"` | Headless mode (SDK) | `claude -p "explain function"` | | `cat file \| claude -p` | Process piped content | `cat logs.txt \| claude -p "explain"` | | `claude -c` | Continue most recent | `claude -c` | | `claude -c -p "query"` | Continue via SDK | `claude -c -p "check types"` | | `claude -r "id" "query"` | Resume session | `claude -r "auth" "finish PR"` | | `claude update` | Update version | `claude update` | | `claude mcp` | Configure MCP servers | See MCP docs | ## Session Control | Flag | Description | Example | |------|-------------|---------| | `--continue, -c` | Load most recent conversation | `claude --continue` | | `--resume, -r` | Resume session by ID/name | `claude --resume auth-refactor` | | `--session-id` | Use specific UUID | `claude --session-id "550e8400-..."` | | `--fork-session` | Create new session on resume | `claude --resume abc --fork-session` | ## Headless Mode (Critical for Agents) | Flag | Descripti...