How to concatenate PDFs
From KIP Wiki
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With GhostScript one can concatenate PDFs without pain: just use the following command line:
gs -q -sPAPERSIZE=a4 -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=newPDFname.pdf PDF1.pdf PDF2.pdf PDF3.pdf
So all the PDFs (PDF1.pdf etc.) are combined in "newPDFname"
One can even use a wildcard to combine all the PDFs in a directory by just replacing (PDF1.pdf PDF2.pdf....) with *.pdf
