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For example I would like to see all the commands provided by the features module, I know I can do
drush help | grep features
But I don't feel safe doing this with all modules present there (you never know when you miss a command). And it often looses important "second lines" such as the shortcut for features-revert-all.
Do you know any command / technique to make sure you get it all safely?
You can use the --filter feature of Drush. For example, you can use drush --filter=features to get all the commands available from the Features module, or drush --filter=views to get all the Drush commands available from the Views module.
You could then also pipe that output into a file if you wanted (e.g. drush --filter=views > views_drush_commands.txt).
You can find the docs on the Drush homepage.
drush help help then you should get exactly what's on the site :)
If the module have less than 4 commands you can't use the drush --filter=MODULE_NAME because you will obtain the following message:
[error] The specified command category onlyone does not exist.
In this case you can use drush --filter and select the number that correspond with Other commands (usually at the end of the list).
You can read more about this behavior in: How to integrate the drush help --filter option with your custom module?
