Show the source of specified function or method.
drush fn-view
function : The name of the function or method to view.
--pipe : Output just the filename of the function or method
--format : Specify how the filename should be printed. Available placeholders are @startline, @endline and @file
View the source code for function "drupal_set_breadcrumb"
fn-view drupal_set_breadcrumb
Edit the file that contains the function "user_access"
vi `drush --pipe fn-view user_access --format='+@startline @file'`
View the source code for method load in the class NodeController
fn-view NodeController::load