rain

package main

import (
	"os"

	"github.com/aws-cloudformation/rain/internal/cmd/rain"
)

func main() {
	os.Args = []string{
		os.Args[0],
	}

	rain.Cmd.Execute()
}

Output:

Rain is a command line tool for working with AWS CloudFormation templates and stacks

Usage:
  rain [command]

Stack commands:
  cat         Get the CloudFormation template from a running stack
  cc          Interact with templates using Cloud Control API instead of CloudFormation
  deploy      Deploy a CloudFormation stack or changeset from a local template
  logs        Show the event log for the named stack
  ls          List running CloudFormation stacks or changesets
  rm          Delete a CloudFormation stack or changeset
  stackset    This command manipulates stack sets.
  watch       Display an updating view of a CloudFormation stack

Template commands:
  bootstrap   Creates the artifacts bucket
  build       Create CloudFormation templates
  diff        Compare CloudFormation templates
  fmt         Format CloudFormation templates
  forecast    Predict deployment failures
  merge       Merge two or more CloudFormation templates
  pkg         Package local artifacts into a template
  tree        Find dependencies of Resources and Outputs in a local template

Other Commands:
  completion  Generate the autocompletion script for the specified shell
  console     Login to the AWS console
  help        Help about any command
  info        Show your current configuration