Pdf Tolkit (pdftk) is a tool to split and merge the pdf’s.
I will show some example to split and merge the pdf’s.
First you need to install the pdftk with following command.
$ sudo apt-get install pdftk
An example to merge pdf’s
$ pdftk input1.pdf input2.pdf cat output merge-output.pdf
Above example is to merge input1.pdf and input2.pdf and create new output file with name merge-output.pdf
An example to split pdf(split from page 10 to 20)
$ pdftk A=input1.pdf cat A10-20 outpout split-output.pdf
Above example is to get only page number 10 to 20 from input1.pdf to split-output.pdf