copied from https://blog.sourcerer.io/why-is-a-java-guy-so-excited-about-node-js-and-javascript-7cfc423efb44

asyncawaitnode10Example.md

const fs = require(‘fs’).promises;
async function cat(filenmz) {
  for (var filenm of filenmz) {
    let data = await fs.readFile(filenm, ‘utf8’);
    await new Promise((resolve, reject) => {
      process.stdout.write(data, ‘utf8’, (err) => {
        if (err) reject(err);
        else resolve();
      });
    });
  }
}
cat(process.argv.slice(2)).catch(err => { 
    console.error(err.stack); 
});