Compile Sass

sass input.scss ouput.css

Watch Changes

If you run the following command, you wont have to compile sass every time you make a change to the code.
With Watcher, anytime you save a change in your sass files, the watcher automatically recompiles it, and overwrites the output.css with the latest changes.

sass --watch input.scss:ouput.css

Make sure not to close the console as long as you’re updating the Sass files, otherwise the watcher will stop working.

Compile a Directory of Sass Files

Sass let’s you compile dozens of individual Sass files into a single compact CSS file.
Place all of your .scss files inside a directory called scss. This folder will contain the input style files.
Create an empty folder named ‘css’. This will contain the output style files.

sass --watch scss:css

Sass will auto-generate files from the first folder into the second folder.

Note: You do not edit or change the CSS files, you only deal with Sass files.