practice linux terminal online for free

Online Simulation for Linux

http://www.compileonline.com/execute_ksh_online.php -shell script

http://bellard.org/jslinux/

http://www.webminal.org

http://linuxzoo.net/

http://www.masswerk.at/jsuix/

https://witsbits.com


Source: https://autellinux.wordpress.com/2013/09/04/online-simulator-in-linux-practice-linux-commands/