title: How can I merge PDF files (or PS if not possible) such that every file will begin in a odd page?
body: <p>I am working on a UNIX system and I'd like to merge thousands of PDF files into one file in order to print it. I don't know how many pages they are in advance.</p>
  
  <p>I'd like to print it double sided, such that two files will not be on the same page. </p>
  
  <p>Therefore it I'd the merging file to be aligned such that every file will begin in odd page and a blank page will be added if the next place to write is an even page.</p>