Reduces file size of PDF files using ghostscript and pdfcpu

pdfsizereducer.sh

#!/bin/bash
infile=$1
if [[ -z $2 ]]; then
  expsz_kb=120
else
  expsz_kb=$2
fi

expsz=$((expsz_kb*1000))
file_size=$(stat -c%s "$infile")
echo "# Reducing PDF file size"
echo "Current Size (bytes): $file_size"
echo "Expected Size(bytes): $expsz"
echo "--------------------------------"

pdfcpu optimize $infile
# TODO: Check if Done

file_size=$(stat -c%s "$infile")

res=150
outfile=${1::-4}-compressed.pdf
while [ $file_size -gt $expsz ]
do
  gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE -dBATCH -dColorImageResolution=$res -sOutputFile=$outfile $infile
  pdfcpu optimize $outfile
  file_size=$(stat -c%s "$outfile")
  res=$((res-10))
  echo res=$res
  echo fs=$file_size
done