This project is no longer maintained, I would suggest using my alternative project jslint-v8 which runs much faster and does not have the same issues caused by the Johnson library (doesn't compile on Ruby 1.9.x).
http://www.rubygems.org/gems/jslint-v8
If you would like to take ownership of this project you are welcome to, contact me here on Github to do so.
JSLintJohnson is simply a ruby wrapper that helps you run JSLint as an automated code quality standards tool inside your projects. It's geared towards being run in a continuous integration process (CI), such as Jenkins.
While it is focused on Ruby projects it can just as easily be used for any other language out there so long as you have Ruby installed on your system.
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Make sure you have Ruby and Rubygems installed on your computer (most operating systems except for Windows have this already)
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In your console run:
gem install jslint-johnson -
Run the following command
jslint-johnson path/to/file.js
For full details on using the command line interface simply type jslint-johnson