Quick script used to merge some PDFs for St. Paul's Lutheran Church of Calhan and Family Heritage Publishers so that they can print the 100 year history book.

pdfMerge.sh

#!/bin/bash - 
#===============================================================================
#
#          FILE: pdfMerge.sh
# 
#         USAGE: ./pdfMerge.sh 
# 
#   DESCRIPTION: Merges two PDFs based on page numbers
# 
#        AUTHOR: Nick Henry (NSH), nicholas.henry@appdirect.com
#       CREATED: 12/08/2014 12:12
#===============================================================================

set -o nounset                                  # treat unset variables as errors

#===============================================================================
#   PASSED VARIABLES
#===============================================================================
USAGE="

USAGE:

  Arguments:
    -h|--help:         Display usage information

    -c|--color-input:  Input file name with color pages
    -g|--gray-input:   Input file name with gray pages
    -o|--output:       Output file name
    -p|--pages:        Space separated list of color pages
  ----------------------------------------------------------

  Examples:
    ${0} -c /tmp/color.pdf -g /tmp/gray.pdf -o /tmp/output.pdf -p '1 4 8 15 32'

    ${0} --color-input='/tmp/color.pdf' --gray-input='/tmp/gray.pdf' \
         --output='/tmp/output.pdf' --pages='1 4 8 15 32'

"

# :WARNING: The quotes around `$@' are essential!
TEMP=`getopt -q -o hc:g:o:p: --long help,color-input:,gray-input:,output:,pages:\
  -n "${0}" -- "${@}"`

# :WARNING: The quotes around `$TEMP' are essential!
eval set -- "$TEMP"

while true ; do
	case "$1" in
		-h|--help)           echo "${USAGE}" ;  exit 0 ;;
		-c|--color-input)    COLOR_IN="${2}" ; shift 2 ;;
		-g|--gray-input)      GRAY_IN="${2}" ; shift 2 ;;
		-o|--output)           OUTPUT="${2}" ; shift 2 ;;
		-p|--pages)             PAGES="${2}" ; shift 2 ;;
		--)                            shift ; break   ;;
	esac
done

TOTAL_PAGES=$(pdfinfo ${COLOR_IN} | grep "^Pages:\s*" | awk '{print $NF}')


#===============================================================================
#   SANITY CHECKS
#===============================================================================
for file in "${COLOR_IN}" "${GRAY_IN}" ; do
  if [[ ! -r "${file}" ]] ; then
    echo "Can't read: ${file}" ; exit 1
  fi
done

if [[ -e "${OUTPUT}" ]] ; then
  echo "Output file already exists: ${OUTPUT}" ; exit 1
fi

if [[ -z "${PAGES}" ]] ; then
  echo "-p|--pages parameter is required" ; exit 1
fi


#===============================================================================
#   MAIN SCRIPT
#===============================================================================
for page in $(seq 1 ${TOTAL_PAGES}) ; do
  if [[ $(echo ${PAGES} | grep -c "\b${page}\b") -eq 0 ]] ; then
    echo "Page '${page}' should be a gray page"
    gs -q -sDEVICE='pdfwrite' -dNOPAUSE -dBATCH -dSAFER \
      -dFirstPage="${page}" -dLastPage="${page}" \
      -sOutputFile="/tmp/${page}.pdf" ${GRAY_IN} 2>/dev/null
  else
    echo "Page '${page}' should be a color page"
    gs -q -sDEVICE='pdfwrite' -dNOPAUSE -dBATCH -dSAFER \
      -dFirstPage="${page}" -dLastPage="${page}" \
      -sOutputFile="/tmp/${page}.pdf" ${COLOR_IN} 2>/dev/null
  fi
done


eval gs -dBATCH -dNOPAUSE -q -sDEVICE='pdfwrite' -sOutputFile="${OUTPUT}" \
  /tmp/{1..${TOTAL_PAGES}}.pdf 2>/dev/null

eval rm -f /tmp/{1..${TOTAL_PAGES}}.pdf


#===============================================================================
#   STATISTICS / CLEANUP
#===============================================================================
exit 0