#!/bin/bash

# merge pdf files with ghostscript

help()
{
cat << EOF
help: $0 options

Merge PDF files together

OPTIONS:
   -h      	You know what this is obviously
   -i		input files (comma separated)
   -o       output file

EOF
}

while getopts “hi:o:” OPTION
do
	case $OPTION in
		h)
			help
			exit 1
			;;
        i)
            input="$OPTARG"
            ;;
		o)
			echo "$OPTARG"
			output="$OPTARG"
			;;
		*)
			break
			;;
	esac
done

if [ -z "$input" ]; then
	echo "invalid input"
	exit 1
fi

if [ -z "$output" ]; then
	echo "invalid output"
	exit 1
fi

input=${input//","/" "}

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sOutputFile="$output" $input