#!/bin/bash

if [ -z "$1" ] && [ -z "$2" ] && [ -z "$3" ]
 then
   echo ""
   echo "usage: pdf-shrink input.pdf output.pdf quality"
   echo "                                       quality : screen   = screen-view-only quality, 72 dpi images"
   echo "                                                 ebook    = low quality, 150 dpi images"
   echo "                                                 printer  = high quality, 300 dpi images"
   echo "                                                 prepress = high quality, color preserving, 300 dpi images"
   echo "" 
 else /usr/bin/gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -dPDFSETTINGS=/$3 -sOutputFile=$2 $1
fi