Loading drush into Git BASH

If your project requires working with Windows and you have both mysysgit and propeople drush installed, it would be really helpful to be able to do something like:

drush | grep super-awesome-drush-function

...yes, you can do this inside ProPeople\Drush\ with Git BASH, but how do you load drush into Git BASH - somewhere outside Drush install directory? Like a drupal web root for instance!

TIA