async-batch.js

const fs = require('fs-extra');
const path = require('path');
const {spawn} = require('child_process');

(async () => {
  const base = path.join(__dirname, 'sandbox');
  await fs.mkdirp(base);
  await fs.outputFile(path.join(base, 'foo.txt'), 'FOO');
  await fs.outputFile(path.join(base, 'bar.txt'), 'BAR');
  const results = await fs.readdir(base)
      .then(dirs => dirs.filter(d => d.startsWith('foo')))
      .then(dirs => dirs.map(d => path.join(base, d)));
  for (const r of results) {
    const process = spawn('ping', ['google.com'], {shell: true});

    function promiseFromChildProcess(child) {
      return new Promise(function (resolve, reject) {
        child.addListener("error", reject);
        let flag = false;
        child.stdout.addListener("close", () => {
          if (flag) {
            resolve();
          }
          flag = true;
        });
        child.stderr.addListener("close", () => {
          if (flag) {
            resolve();
          }
          flag = true;
        });
      });
    }

    process.stdout.on('data', (data) => {
      console.log(`stdout: ${data}`);
    });
    process.stderr.on('data', (data) => {
      console.log(`stderr: ${data}`);
    });
    process.on('close', (code) => {
      console.log(`child process exited with code ${code}`);
    });
    await promiseFromChildProcess(process);
  }
  console.log('aaa');
  await fs.remove(base);
})();