I just received a pdf textbook comprised of some 20 separate pdfs (by chapter) with quasi-regular names. Is there a way for counting the pages in th book w/o openning each file (or going through the properties)?

[solution can be for Windows or Ubuntu]

I just received a pdf textbook comprised of some 20 separate pdfs (by chapter) with quasi-regular names. Is there a way for counting the pages in the book without opening each file (or going through the properties)?

[solution can be for Windows or Ubuntu]