How to add an product attribute to multiple attribute sets programmatically?

Question

How to add an product attribute to multiple attribute sets programmatically?

This question has been answerded for Magento 1, but how does it work with Magento 2?

Edit: I create all my custom attributes in an installation script. They are created when installing magento (I add my extentions to the Magento folder before installing it on a server). At this time I don't know about the attrubute sets. They are created later during an import. So I want to assign existing custom attributes when creating an attribute set.

Answer 1

If you provide a value for 'group' in the attribute configuration array the attribute will be added to that group in all attribute sets:

$eavSetup->addAttribute('catalog_product', 'my_attribute', [
    ...
    'group' => 'General',  // or some other group name
    ...
]);