const execSync = require('child_process').execSync;

// import { execSync } from 'child_process';  // replace ^ if using ES modules

​

const output = execSync('ls', { encoding: 'utf-8' });  // the default is 'buffer'

console.log('Output was:\n', output);

const { exec } = require('child_process');

  exec('ls', (error, stdout, stderr) => {

    if (error) {

        console.error(`exec error: ${error}`);

        return;

    }

    console.log(`stdout: ${stdout}`);

    console.error(`stderr: ${stderr}`);

  });

just a simple script for javascript shell

const fs = require('fs');

​

function buildTree(startPath) {

  fs.readdir(startPath, (err, entries) => {

    console.log(entries);

  });

}

​

buildTree('/home/jim/Desktop/theme');

​

for extra info visit below link

https://www.sitepoint.com/shell-scripts-javascript/