I am trying out node to run a simple js script to read a file,
following is the content of my script:

use strict

fs = require('fs');

var args = process.argv.slice(2);

fs.readFile(args, 'utf8', function (err,data) {

  if (err) {

      return console.log(err);

        }

    console.log(Reading from file  + args);

    console.log(data);

});

when I try to run this using the following command:
node myTestFile.js testFile

I get this error:

fs = require('fs');

   ^

ReferenceError: fs is not defined

    at Object.<anonymous>     (/<Path to file>/myTestFile.js:2:4)

at Module._compile (module.js:570:32)

at Object.Module._extensions..js (module.js:579:10)

at Module.load (module.js:487:32)

at tryModuleLoad (module.js:446:12)

at Function.Module._load (module.js:438:3)

at Module.runMain (module.js:604:10)

at run (bootstrap_node.js:393:7)

at startup (bootstrap_node.js:150:9)

at bootstrap_node.js:508:3

Isn't fs in node like a library like stdio in c ?

Do we have to explicitly define the library path somewhere in node ?

How can I get the above example to work ?