pdfmerge.sh

#!/bin/sh
# Merges multiple PDF files into a single PDF file
#
# pdfmerge.sh [input-1.pdf] [input-2.pdf] [output.pdf]
#
# Example: pdfmerge.sh input-1.pdf input-2.pdf output.pdf
#
# written by: Knee-cola
#
# The trick: ghostscript (gs) will do PDF merging for you, it's just not
# obvious and the required defines are not listed in the manual page. 

if [ $# -lt 3 ] 
then
        echo "Usage: pdfmerge.sh input-1.pdf input-2.pdf output.pdf"
        exit 1
fi
gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE="$3" -dBATCH "$1" "$2"