fly

The `fly` command‑line interface provides the official way to communicate with a Concourse CI server. It lets users create, update, and control pipelines, trigger jobs, and inspect build results directly from a terminal. By exposing Concourse’s API through familiar commands, `fly` enables automation of CI/CD workflows without needing a graphical UI.

Typical users are developers and operations engineers who run Concourse for continuous integration, delivery, and broader automation tasks. The tool supports actions such as setting pipeline definitions, pausing or unpausing pipelines, managing resources, and retrieving logs, making it suitable for both simple and complex pipeline configurations.

What distinguishes `fly` is its tight integration with Concourse’s design principles—idempotent, immutable, and declarative pipelines—allowing users to interact with the system in a way that preserves these guarantees. The CLI is written in Go, is stable, and officially supported on macOS, serving as the primary interface for managing Concourse automation.