Installing pdftk on Centos 5 and 6 – PDF management and utility tool
PDF files are not the easiest beasts to handle at the best of times, however there is a tool called pdftk which is freely available to make your life a lot easier!
PDFTK has the functionality to split, merge, watermark, and a variety of other useful tasks to make handling data much easier.
Version 2.02 is the most complete and flexible version and can be installed on Red Hat or Centos like this :