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How to run unix commands from nodejs?

Nodejs allows us to execute linux commands from its child process module as shown below. 
var exec = require('child_process').exec;

// any unix based command
var cmdToLaunch = "ls -la";

function execCB (error, stdout, stderr) {
    if (error) {
        console.error(`exec error: ${error}`);
        return;
    }
    console.log('stdout: ' + stdout);
    console.log('stderr: ' + stderr);
}

var app = exec(cmdToLaunch, execCB);

// Use app.pid to get reference to the application and take further actions on the application
Check out the reverse of this, like how to run node script from bash script.