pdfcompress

#!/bin/bash

# pdftk is needed
# Step 1: convert to ps
# Step 2: convert back to pdf
# source: https://pandemoniumillusion.wordpress.com/2008/05/07/compress-a-pdf-with-pdftk/

INPUT="$1"
OUTPUT=""
PS=".ps"
PDF=".pdf"
COMP="_compressed"
TMP="/tmp/$INPUT$PS"

if [[ -z "$2" ]] ; then
	read -p "Original File will be overwriten. Append \"$COMP\" (c), continue (Y) or aboard (n) " -n 1 -r
	echo    # (optional) move to a new line
	if [[ $REPLY =~ ^[Y]$ ]] ; then
		pdf2ps "$INPUT" "$TMP"
		ps2pdf "$TMP" "$INPUT"

	elif [[ $REPLY =~ ^[c]$ ]] ; then
		pdf2ps "$INPUT" "$TMP"
		# TODO add sed args to remove .pdf before _compressed
                newname=$(sed -e "s/.pdf//g" <<< $INPUT)$COMP$PDF
		ps2pdf "$TMP" "$newname"
	fi

else 
	OUTPUT="$2"
	pdf2ps "$INPUT" "$TMP"
	ps2pdf "$TMP" "$2"
fi