Combine some pdfs into one

This started by downloading some e-books from our national education government sites which consists of e-books of some subjects which parted into chapters.
I was just thinking that "could they just be combined into one file only ?"

Based on this article, i got my answer : we can !!

First, download some files from terminal by typing ;

• sudo apt-get install gs pdftk
  

Second, execute those pdfs

• gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=combinedpdf.pdf -dBATCH 1.pdf 2.pdf 3.pdf

Which OUTPUTFILE=the name of combination file
1.pdf 2.pdf 3.pdf are the name of the partial pdfs

After you run the above command, a new PDF file called combinedpdf.pdf will be created with your individual files merged according to the order that you have you listed.

regards;
~E~