rotate-pdf.sh

#!/bin/bash

# rotate scanned pdf pages by 180°
# name all pages 

help=$(cat <<EOS
  
  Usage: rotate-pdf.sh IN.pdf OUT.pdf [PAGES]

  Read from IN.pdf, rotate PAGES by 180° and write out to OUT.pdf
  Requires `pdftk` to work.

  Example: rotate-pdf.sh in.pdf out.pdf 2 4 7
  
EOS
)

if [ -z "$1" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  echo -e "$help"
  exit 1
fi

#-----------------------------------------------------------------------

in=$1
shift
out=$1
shift
south=($@)

#-----------------------------------------------------------------------

pageCount=$(pdftk $in dump_data 2> /dev/null | grep "NumberOfPages" | cut -d":" -f2 | xargs expr)

pages=()

for ((i=1; i<=$pageCount; i++)); do
  ok=0
  for p in ${south[@]}; do
    if [ $i -lt $p ]; then
      break
    elif [ $i -eq $p ]; then
      pages+=(${i}south)
      ok=1
    fi
  done
  if [ $ok -eq 0 ]; then
    pages+=(${i})
  fi
done

echo ${pages[*]}
pdftk $in cat ${pages[*]} output $out