<https://forums.slipstick.com/threads/90180-from-a-nested-contact-folder-structure-to-a-categorised-contact-structure/>
<http://schema.org/articleBody>
"As part of my migration process to Arch Linux, I needed to transfer my contacts, stored in a deep tree of nested folders, into a much more widespread category structure. In this way I'd able to store them in Google Contacts or in Thunderbird..."
<https://forums.slipstick.com/threads/90180-from-a-nested-contact-folder-structure-to-a-categorised-contact-structure/>