specialFolderPath() on Linux?

[Phil Davis]

The docs say these specialFolderPath() keywords are valid for Unix:
        Home: The current user's home directory (e.g. "/home/fred")
        Desktop: The current user's desktop (e.g. "/home/fred/Desktop")
        Temporary: For storage of temporary files (typically "/tmp")

Can anyone please tell me:
1) if these also work on Linux
2) if there are others besides these that work on Linux

I'm looking for a Linux equivalent to Mac's 
specialFolderPath("preferences").

Thanks -
-- 
Phil Davis

PDS Labs
Professional Software Development
http://pdslabs.net