Use ghostscript to easily combine multiple PDFs into one PDF document from the command line.
First make sure you have ghostscript installed:
sudo apt-get install ghostscript
Here is the magic command. Here place the order of existing PDFs in the order you wish them to appear in the combined document.
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=combined.pdf existing_1.pdf existing_2.pdf
The output will look similar to this:
stmiller@brahms:~/asdf$ gs -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=report_final.pdf paul_office_2.pdf paul_email.pdf order.pdf Report04-5.pdf GPL Ghostscript 8.71 (2010-02-10) Copyright (C) 2010 Artifex Software, Inc. All rights reserved. This software comes with NO WARRANTY: see the file PUBLIC for details. Processing pages 1 through 1. Page 1 Processing pages 1 through 1. Page 1 Processing pages 1 through 1. Page 1 Processing pages 1 through 1. Page 1 stmiller@brahms:~/asdf$
Sweet!
