@nomiclabs/buidler/sample-project/scripts/sample-script.js

// We require the Buidler Runtime Environment explicitly here. This is optional 
// but useful for running the script in a standalone fashion through `node <script>`.
// When running the script with `buidler run <script>` you'll find the Buidler
// Runtime Environment's members available in the global scope.
const bre = require("@nomiclabs/buidler");

async function main() {
  // Buidler always runs the compile task when running scripts through it. 
  // If this runs in a standalone fashion you may want to call compile manually 
  // to make sure everything is compiled
  // await bre.run('compile');

  // We get the contract to deploy
  const Greeter = await ethers.getContractFactory("Greeter");
  const greeter = await Greeter.deploy("Hello, Buidler!");

  await greeter.deployed();

  console.log("Greeter deployed to:", greeter.address);
}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main()
  .then(() => process.exit(0))
  .catch(error => {
    console.error(error);
    process.exit(1);
  });