Merge pdf files (ghostscript)

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=veraenderungsmitteilung.pdf out2014.pdf out2015.pdf

reduce size with gs

gs -q -dNOPAUSE -dBATCH -dSAFER -dPDFA=2 -dPDFACompatibilityPolicy=1 -dSimulateOverprint=true -sDEVICE=pdfwrite -dCompatibilityLevel=1.3 -dPDFSETTINGS=/screen -dEmbedAllFonts=true -dSubsetFonts=true -dAutoRotatePages=/None -dColorImageDownsampleType=/Bicubic -dColorImageResolution=150 -dGrayImageDownsampleType=/Bicubic -dGrayImageResolution=150 -dMonoImageDownsampleType=/Bicubic -dMonoImageResolution=150 -sOutputFile=verlaengerung_mietvertrag.pdf mietvertrag.pdf

extract pages from a pdf with gs

• https://www.npcglib.org/~stathis/blog/2012/01/23/extracting-pages-from-a-pdf-with-ghostscript-gs/

#!/bin/bash

usage() {
        echo "$0 {first page} {last page} {input pdf file} {output pdf file}"
}

extract() {
  gs -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dSAFER \
     -dFirstPage=$1 -dLastPage=$2 \
     -sOutputFile=$4 $3
}


EXPECTED_ARGS=4
E_BADARGS=65

if [ $# -ne $EXPECTED_ARGS ]
then
  usage
  exit $E_BADARGS
else
  extract $1 $2 $3 $4
fi

convert pdf to png

pdftoppm -png -r 300 input.pdf output.png