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# Command Line Interface
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Flask provides a CLI system for creating custom commands and managing applications from the command line.
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## Capabilities
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### CLI Functions
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```python { .api }
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def with_appcontext(f: Callable) -> Callable: ...
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def load_dotenv(path: str | None = None) -> bool: ...
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```
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### CLI Classes
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```python { .api }
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class FlaskGroup(click.Group): ...
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class AppGroup(click.Group): ...
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```
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## Usage Examples
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### Custom Commands
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```python
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from flask import Flask
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import click
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app = Flask(__name__)
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@app.cli.command()
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def init_db():
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    """Initialize the database."""
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    click.echo('Database initialized')
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@app.cli.command()
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@click.argument('name')
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def create_user(name):
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    """Create a new user."""
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    click.echo(f'User {name} created')
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```