How can I import all of my .enex files at once?

Since I am running Ubuntu, I don't have a native Evernote client on my computer. As a work-around for the export, I used CloudHQ and synced all my Evernote folders as .enex files with Box. I downloaded them from Box, but when I try to import them, the function won't let me select a folder - it just opens it and let's me select a single .enex file. With a little over 400 of them this is not practical. At the very least I want to be able to select multiple files - I can reproduce the file structure easily enough - I just want to at least be able to import all the files within a single folder together into a folder in Joplin