A simple example showing a Node program invoking the `ls` child process in a unix environment

child-process.js

(() => {
  const { spawn } = require('child_process');
  const ls = spawn('ls', ['-lh', '/usr']);
  
  ls.stdout.on('data', (data) => {
    console.log(`stdout: ${data}`);
  });
  
  ls.stderr.on('data', (data) => {
    console.log(`stderr: ${data}`);
  });
  
  ls.on('close', (code) => {
    console.log(`child process exited with code ${code}`);
  });
})();