Command Line Arguments

 

'use strict';

/* Command Line Arguments */

// [0] The path of the executable that started the Node.js process

// [1] The path to this application

// [2-n] the command line arguments

console.log(process.argv);

Output:- 

Get arguments 

'use strict';

// Set first argument as username.

var username = process.argv[2];

// Check if the username hasn't been provided.

if (!username) {

    // require('path').sep    Provides the platform-specific path segment separator  LINK :- https://nodejs.org/api/path.html#pathsep

    /*The split() method

        splits a string into an array of substrings.

        returns the new array.

        does not change the original string.

        If (" ") is used as separator, the string is split between words.

    */

    // Extract the filename

    var appName = process.argv[1].split(require('path').sep).pop();

    // Give the user an example on how to use the app.

    console.error('Missing argument! Example: %s YOUR_NAME', appName);

    process.exit(1);

    // Exit the app (success: 0, error: 1).

}

else

{

    // Print the message to the console.

    console.log('Hello %s!', username);

}

OUTPUT:- 

PS E:\node_server> node .\server.js pradipta paul 25 28

Hello pradipta!

PS E:\node_server>