This has been rolled into CodeIgniter Reactor 2.0.1 so is no longer necessary.
For more info visit http://codeigniter.com/user_guide/general/cli.html
I have been working on a few random things in spare time at work, one of them is getting CI to work on the command line. Getting it to accept parameters was much easier than I expected, all it requires is a simple extension to the URI class.
Installation
Copy the file to application/libraries/
Set-up
In your config, set one of the following values for uri_protocol.
$config['uri_protocol'] = "AUTO"; // Works for web and command line
$config['uri_protocol'] = "CLI"; // Command line only
Or to have it working on web with a specific uri type and command line at the same time, change path info to any of the normal CI uri types.
$config['uri_protocol'] = isset($_SERVER['REQUEST_URI']) ? 'PATH_INFO' : 'CLI';
cd into your CI set-up and run index.php like below.
php index.php controller method param1 etc
For easier interaction with command line input/output/prompts etc try this CLI library