Just another one of the Mac’s awesome semi-hidden features: OS X has Python script that merges pdfs from the command line.
Located at “/System/Library/Automator/Combine PDF Pages.action/Contents/Resources”, the join.py script takes the pdf file names as input and produces a merged document!
Usage: ./join.py –o <file> <inputfile1> <inputfile2> [--append] [--shuffle] [--preview] [--verbose]
Macs rule! 
(I remember reading somewhere that UNIX has a similar script. Can anyone confirm/locate it?)
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