jsPdftk is a PDF toolkit driven by the Rhino JavaScript interpreter.
This software is licensed under AGPL version 3 or later. See LICENSE for details.
jspdftk info < input.pdf
cat input.pdf | jspdftk merge background.pdf > output.pdf
cat input.pdf | jspdftk cat 2.pdf 3.pdf > output.pdf
cat input.pdf | \
jspdftk cat 2.pdf 3.pdf | \
jspdftk merge background.pdf > output.pdf