How to use WhatWeb on Kali Linux

About WhatWeb:
                                  WhatWeb identifies websites. Its goal is to answer the question, "What is that Website?". WhatWeb recognises web technologies including content management systems (CMS), blogging platforms, statistic/analytics packages, JavaScript libraries, web servers, and embedded devices. WhatWeb has over 1500 plugins, each to recognise something different. WhatWeb also identifies version numbers, email addresses, account IDs, web framework modules, SQL errors, and more.

How To Use Whatweb :

Open terminal type whateweb[url]
Example:whateweb http://www.mashable.com(as shown in below image).

The above screenshot identifies mashable.com & shows the output