@
Earthlark
For Linux there is the
Recoll Integration PI
In Windows I do what
cybmole suggests; retain a Windows Search-able format (doc, rtf, txt, odt - sadly not epub or mobi etc). After doing a Windows Search I massage the results (list of files) with a couple of Notepad++ macros to create a csv, which I feed into the
Import List which I get to show the list of books in the Calibre GUI (it marks them)
I usually search within a specific library folder (eg X:/Libraries/Journals) or across all libraries (X:/Libraries)
I thought about automating it - but a) I like being able to winnow the results list before submitting it to Import List, b) I'm lazy and c) I prefer to see what going on.
The same thing could be done on a Mac with Spotlight, which I'm pretty certain will search in epub and other ebook formats
BR