To make the pdf files smaller on linux,
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
Got this information from the following website,
http://ubuntuforums.org/showthread.php?t=1133357&page=3
Keywords: pdf