Free software, free society: Richard Stallman at TEDxGeneva 2014

It is the first TEDx talk of the founder of Free Software movement. Stallman, RMS for short, has changed the world with his vision of freedom for the digital age. He launched the GNU operating system, used with Linux as a component, and inspired the development of Creative Commons licences and Wikipedia project. In this talk, Stallman describes how nonfree programs give companies control of their users and what users can do in order to recover control over their computing.

Install Node.js on Ubuntu 14.04 via PPA

To install Node.js on Ubuntu 14.04, enter the command:
$ sudo add-apt-repository ppa:chris-lea/node.js
$ sudo apt-get update
$ sudo apt-get install nodejs

Linux command - tree, to list directories in a tree-like format

tree is a Linux command to list contents of directories in a tree-like format.

To install tree on Ubuntu:
$ sudo apt-get install tree