"Creating and reading PDF files in Linux is easy, but
manipulating existing PDF files is a little trickier. Countless
applications enable you to fiddle with PDFs, but it's hard to find
a single application that does everything. The PDF Toolkit (pdftk)
claims to be that all-in-one solution. It's the closest thing to
Adobe Acrobat that I've found for Linux.
"Developer Sid Steward describes pdftk as the PDF equivalent of
an 'electronic staple remover, hole punch, binder, secret decoder
ring, and X-ray glasses...'"