Display a list of all existing features and packages available to be generated. If a package name is provided as an argument, then all of the configuration objects assigned to that package will be listed.
drush features-list-packages
package : The package to list. Optional; if specified, lists all configuration objects assigned to that package. If no package is specified, lists all of the features.
Display a list of all existing featurea and packages available to be generated.
drush features-list-packages
Display a list of all configuration objects assigned to the 'example_article' package.
drush features-list-packages 'example_article'