require('fs')

const fs = require('fs')

const content = 'Some content!'

fs.writeFile('/Users/joe/test.txt', content, err => {
  if (err) {
    console.error(err)
    return
  }
  //file written successfully
})

fs.readFile('/etc/passwd', (err, data) => {
  if (err) throw err;
  console.log(data);
});

fs.readFile('/etc/passwd', 'utf8', callback);

  var fs = require('fs');

fs.appendFile('mynewfile1.txt', 'Hello 
  content@@@@@@@@@@@@@@@@@@@@2!', function (err) {
  if (err) throw err;
  
  console.log('Saved!');

  });