for file in *.pdf; do echo "Optimizing $file..." gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \ -dNOPAUSE -dQUIET -dBATCH -sOutputFile="temp_$file" "$file" && \ mv "temp_$file" "$file" done