Extract AMI id with terraform

extract-ami-id.tf

provider "aws" {
	region = "eu-west-1"
	profile = "---name-of-profile---"
}

data "aws_ami" "resourcename" {
	most_recent = true

	filter {
		name = "name"
		values = ["ami-name-*"]
	}

	filter {
		name = "virtualization-type"
		values = ["hvm"]
	}
}

output "image_id" {
	value = "${data.aws_ami.resourcename.id}"
}

Steps to get the AMI id from AWS using terraform:

Download and change .tf file
Do terraform init to download providers (most of the time not required)
Do terraform apply for getting the state based on the resources described in the .tf file
Do terraform output image_id > /path/to/file for writing AMI id to file