explanation how child process works in node js

child_process_exec.js

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

exec("open https://facebook.com");

exec('ls', function(err, stdout){
  if(err)
    console.log(err)

  console.log("Listing finished..")
  console.log(stdout);  
});


exec("git version", function(err, result){
  if(err)
    console.log(err)

  console.log("Listing finished..")
  console.log(result);  
});