Linux Emulator: Test and Learn Linux Commands in Web Browser

If you want to learn Linux / Unix commands but don't want to install the OS, 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 any Linux distribution, simply open the URL in a web browser and test desired Linux commands.
This PC emulator has been written in Javascript and the emulated hardware consists in following devices:

• 32-bit (x86) compatible CPU
• 8259 Programmable Interrupt Controller
• 8254 Programmable Interrupt Timer
• 16450 UART
• Real Time Clock
• IDE interface and hard disk

PC emulator supports following browsers officially:

• Mozilla Firefox
• Google Chrome
• Opera
• Internet Explorer

You can run all popular and basic commands such as cat, cd, chmod, chown, chroot, date, echo, find, help, ls, rm, su, time, vi, etc.
To scroll back in the terminal, you can use Ctrl+Up, Ctrl+Down, Ctrl+PageUp and Ctrl+PageDown key combinations.
Start Testing Linux Commands in Web Browser

Source: http://www.askvg.com/pc-emulator-test-and-learn-linux-commands-in-web-browser/