The old space invaders game that can be run in the bash shell on linux systems. As seen in the amazing book "Shell Scripting: Expert Recipes for linux, bash and more.
Open any text editor in your linux distribution, copy and paste the code from the file labelled "space_invaders" and save it. You can choose any file name you wish. Once done, type:
chmod u+x the_file_name
then, finally type:
./file_name
The game will start. Enjoy!!