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Mappings: 
  RegionMap: 
    us-east-1: 
      32: "ami-6411e20d"
      64: "ami-7a11e213"
    us-west-1: 
      32: "ami-c9c7978c"
      64: "ami-cfc7978a"
Resources: 
  myEC2Instance: 

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$ aws cloudformation create-stack --stack-name ec2-$(date +%s) --template-body file://ec2-join-tag-example.yml --parameters file://params-app-role-env.json

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Parameters:
  App:
    Description: "Examples: blog, api"
    Type: String
  Env:
    Description: "Examples: prod, stag, dev"
    Type: String
  Role:
    Description: "Examples: web, worker, scheduler"
    Type: String

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[app, env, role].join('-')

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$ aws cloudformation create-stack --stack-name ec2-$(date +%s) --template-body file://ec2-if-env-is-prod.yml --parameters "ParameterKey=Env,ParameterValue=prod"

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Parameters:
  LargerInstance:
    Description: Whether a larger instance should be used
    Default: false
    Type: String
    AllowedValues: [true, false]
Resources:
  EC2Instance:
    Type: AWS::EC2::Instance
    Properties:

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if env == “prod”
 # create a large m4.large instance for production environment
else
 # create a small t2.micro instance for development environment
end

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y = x
x = 1
print(y) # => prints 1

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x = 1
y = x
print(y) # => prints 1

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$ aws cloudformation create-stack --stack-name ec2-$(date +%s) --template-body file://ec2-param.yml --parameters file://params.json