Sass already comes with a lot of power, from nesting html tags to generating mixins, and many more powerful feutures that speed up development of highly scalable cascading stylesheets. 

To start to use sass, compass ecc, Ruby must be installed. Osx ships with Ruby out of the box, other operating systems have several options to install like ruby installer. Finally, comes Ruby Bundler to easly build and generate templates for individual projects.

When you try this 

sudo gem install sass

You may get this error:

ERROR:  While executing gem ... (Errno::EPERM)

    Operation not permitted - /usr/bin/sass

That is because we need to specify the directory where binary files are located like so:

sudo gem install -n /usr/local/bin sass

There are many libraries and mixins out there. Here are some of the most famous ones and the commands to install them with Gem: 

sudo gem install -n /usr/local/bin bourbon

sudo gem install -n /usr/local/bin neat

sudo gem install -n /usr/local/bin compass

sudo gem install -n /usr/local/bin sass

sudo gem install -n /usr/local/bin bundler

sudo gem install -n /usr/local/bin refills

Gem install command line reference

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