PDF Merge Or Split in Ubuntu Linux.

     Suppose,
1. you have a PDF file (.pdf) with more than one pages in it and you want to split it into multiple files with some options (like page range etc).
2. you have multiple PDF files and you want to merge into a single file

Then, there is a package in Ubuntu with name, "pdfsam".

It can be installed with below command,

sudo apt-get install pdfsam

OR 

you may download it from following link and install manually,
https://launchpad.net/ubuntu/+source/pdfsam

OR

You may search sites of Ubuntu for the package.


I hope this information helps you all.