I had to do that once. Realized I only really want to re-read about 20 series, so I moved those to a another folder and rm -rf the rest

over 5 years I'd managed to collect about 60 GB of manga.. not really sure how >.<

that's a lot of titles!

full dumps of several major libraries before they started removing stuff due to copyright claims.

Not all of that is usable or interesting and there's quite some duplication, which is why I need to sort it.

In particular, I don't need Russian translation of any books I also have in English...

counts. About 10000 titles worth of books.

And something like 2000 titles worth of manga and comics.

stops at 150 titles. This is going MUCH slower than I'd like.

unpacks the other library dump. 50000 titles total.

This is going to take practically forever.