Batch recompress PDF's for less volume

#!/bin/bash
# Recompress all the PDF's in the current directory
# with ImageMagic convert utility for less volume.
# -------------------------------------------------
# Experiment with these settings for optimal result
# QUALITY : 1..99 / JPEG compression quality
# DENSITY : 100..600 / Dots per inch (VxH)
QUALITY=30
DENSITY=150
# -------------------------------------------------
for FILE in *.pdf ; do
  echo -en "Compressing file ${FILE}... "
  convert -density ${DENSITY}x${DENSITY} -quality ${QUALITY} -compress jpeg "${FILE}" "${FILE}_recompressed.pdf" && echo -e "OK"
done