Running Brakeman
The simplest way to get started with Brakeman is to just run it with no options in the root directory of your Rails application:
cd your_rails_app/
brakeman
This will scan the application in the current directory and output a report to the command line.
Alternatively, you can supply a path as an option to Brakeman:
brakeman your_rails_app
Even more specifically:
brakeman -p your_rails_app