Shell Scripting Tutorial-1: Introduction
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This is the first tutorial in this series. Learn about the prerequisites that must be met before beginning the course.
Learn to install Ubuntu: http://www.youtube.com/watch?v=w8a-smrPlvE
Read documentation here: https://help.ubuntu.com/community/Installation
Download Ubuntu here: http://www.ubuntu.com/download/desktop
You may explore other Linux distributions as well. Read this article to know more about open source Linux distributions: http://en.wikipedia.org/wiki/Comparison_of_Linux_distributions