#!/bin/sh

if [ $# -ne 4 ]; then
	cat<<EOF
Usage: ${0##*/} PDFFILE FIRSTPAGE LASTPAGE DESTFILE

Extract a range of pages from a PDF.
EOF
	exit
fi

if [ ! -f "$1" ]; then
	echo "$1 is not a valid file."
fi

gs -sDEVICE=pdfwrite -dNOPAUSE -dSAFER -dSAFER -dFirstPage=$2 -dBATCH -dLastPage=$3 -sOutputFile="$4" "$1"