Question: I am looking for software/application that can help me of checking some Linux commands working in a browser irrespective of OS. I mean Live CLI in the browser.

Thank you.

Answer: 
Amongst many other solutions for an online Linux emulator there is [Bellard's Javascript emulator](http://bellard.org/jslinux/):

![enter image description here](https://i.stack.imgur.com/0LkSz.png)
Ok have found something after some googling , <http://www.compileonline.com/execute_ksh_online.php>

Posting here for helping others:

![enter image description here](https://i.stack.imgur.com/M793S.png)