append.js

const fs = require('fs');
const path = require('path');

fs.writeFile('content.txt', 'This is my first file!', (err) => {
  if (err) {
      throw err;
  };

  process.stdout.write('File created successfully!');
});

const filePath = path.join(process.cwd(), 'content.txt');

fs.readFile(filePath, (error, content) => {
  if (error) throw error;

  process.stdout.write(content);
});

// fs.unlink(filePath, (error) => {
//   if (error) throw error;

//   console.log('File deleted!')
// });

fs.readdir(process.cwd(), (error, files) => {
  if (error) throw error;

  console.log(files);
});

fs.mkdir(`${process.cwd()}/myFolder/secondFolder`, { recursive: true }, (err) => {
  if (err) throw err;

  console.log('Folder created successfully!');
});

// fs.rmdir(`${process.cwd()}/myFolder/`, { recursive: true }, (err) => {
//   if (err) throw err;

//   console.log('Folder/s removed successfully!');
// });

fs.rename(`${process.cwd()}/myFolder/secondFolder`, `${process.cwd()}/myFolder/newFolder`, (err) => {
  if (err) throw err;

  console.log('Directory renamed!');
});

fs.appendFile(filePath, '\nNew data to be added!', (err) => {
  if (err) throw err;

  console.log('New content added!');
});

fs.rename(`${process.cwd()}/content.txt`, `${process.cwd()}/newFile.txt`, (err) => {
  if (err) throw err;

  console.log('File renamed!');
});