Is there any website having command line environment of Linux, for practicing commands? [closed]

Question

I was wondering whether I could practice LINUX commands and shell scripting, online, over a website which could provide me an editor to practice them. And I know that probably the easiest thing to do would be to download a Linux LIVE CD and then practice shell scripting, but apart from it, I want to practice them online, anywhere I want, anytime I want and on any system, without bothering about booting from a LIVE CD.

Answer 1

There is a quite a good one here:

Javascript PC Emulator - http://bellard.org/jslinux/

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Answer 2

There is a site linuxzoo that provides you the linux environment, but you need to use a emulator(like Putty) to connect to this webserver and execute the commands. please go through the site it might be helpful.