pdf-add-blanks
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	#!/bin/bash

	function usage() {
	if [ $# -gt 0 ]; then
	echo "Error: $@"
	fi
	echo "USAGE: $(basename $0) source.pdf [destination.pdf]"
	}

	# Sanity checks
	for com in $(echo "ps2pdf pdftk pdfinfo"); do
	command -v $com > /dev/null
	if [ $? -eq 1 ]; then
	usage "Command \"$com\" not found. Please, make sure the command is available."
	exit
	fi
	done

	TMP_DIR='/tmp'


	if [ $# -lt 1 ]
	then
	usage "No arguments provided."
	exit 1
	else
	INPUT=$1
	OUTPUT=$2
	if [ -z $2 ]; then
	OUTPUT=$1
	fi

	TMP_OUTPUT=$TMP_DIR/$$_tmp
	BLANK=$TMP_DIR/$$_blank

	if [ ! -r $INPUT ]; then
	usage "File not found: $INPUT"
	exit 1
	fi

	NUM=$(pdftk $1 dump_data \| grep 'NumberOfPages' \| awk '{split($0,a,": "); print a[2]}')
	if [ -z "$NUM" ]; then
	usage "Number of pages not detected :-("
	exit 1
	fi
	PAPER_SIZE=$(pdfinfo $INPUT \| grep '^Page size:' \| cut -d ':' -f 2- \| cut -d '(' -f 2 \| cut -d ')' -f 1 \| tr '[A-Z]' '[a-z]')
	if [ -z "$PAPER_SIZE" ]; then
	echo "Defaulting to A4 paper size..."
	PAPER_SIZE="a4"
	fi

	COMMSTR=''
	for i in $(eval echo {1..$NUM}); do
	COMMSTR="$COMMSTR A$i B1"
	done

	echo "" \| ps2pdf -sPAPERSIZE=$PAPER_SIZE - $BLANK
	pdftk A=$INPUT B=$BLANK cat $COMMSTR output $TMP_OUTPUT
	mv $TMP_OUTPUT $OUTPUT
	rm -f $TMP_DIR/$$_*
	fi

	# RIP
	exit 0