flyctl:tldr:d81a7

The command "flyctl auth login" is used to authenticate and log in to the Flyctl command-line interface (CLI) tool.

When you run this command, it initiates the login process, usually by opening a web browser window, where you'll be redirected to the Fly.io website. Once you're there, you'll be prompted to provide your Fly.io account credentials (email and password or alternative authentication methods like GitHub, Google, etc.).

After successful authentication, you'll receive an authentication token that will be stored on your machine. This token allows the Flyctl CLI tool to access your Fly.io account and perform various operations on your behalf, such as deploying applications, managing resources, and monitoring your deployments.

Once you are logged in, you can start using other flyctl commands to interact with your Fly.io account and deploy your applications to Fly.io's infrastructure.