If you want to learn Linux / Unix command but don't want to install it, here is something interesting for you.
"PC Emulator" created by "Fabrice Bellard" allows you to test Linux commands in your favorite web browser. No need to install Linux, simply open the URL in browser and test desired Linux commands.

This PC emulator is written in Javascript and support following browsers officially:
- Firefox 4.x
- Chrome 11
- Opera 11.11
- Internet Explorer 9
Start Testing Linux in Browser
Thanks to our reader "Mutz777" for sharing it...
This article was posted by VG in following section: Linux.
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Darshit
Dear VG,
The way you put this post, you remove the great achievement by Bellard of writing an ASM simulator in pure javascript. He did not intend to make an online linux kernel to learn Unix commands. It was a project to simulate microprocessors i Javascript, and it works so well, that it can run a whole Linux kernel in it!!
VG
^^ Actually the part which most of the users might find interesting, was highlighted. :)
M1cha
This is a very great tool.
I used this tool to download jslinux and use it with a normal terminal-window:
github.com/tlrobinson/node-jslinux
Is there a way ti implement an network-interface so the VM has network/internet?
Would be great for APT
BlacMoon
How will i use this?
Only .bin file?
VG
^^ What do you mean by bin file? Just open the link in browser and it'll launch the Linux terminal.
BlacMoon
Oops. okay... I understood now.
IDM downloaded that.... so.....