I have a pdf-file pdf1 with bookmarks and I have another pdf-file pdf2. I want to replace all (or part of) the pages of pdf1 with the pages of pdf2 so that the bookmarks stay where they were. In Acrobat it's a trivial procedure, but how to do it in Unix? As I understand (or am I mistaken?), pdftk wipes off the bookmarks. Would be nice to do it in cli...