colorpages_printstring.bash

#!/bin/bash
#
# colorpages_printstring.bash
#
# Tool to print only color pages from a PDF (duplex). 
# Generates a string to be used for common printing dialogs which only contains pages (back and front) with color.
#
# usage: colorpages_printstring <your>.pdf
#
# requirements: ghostscript (gs)
#
# TODO: Remove duplicates
pages=`gs -o - -sDEVICE=inkcov $1 |sed '/^Page*/N;s/\n//'|grep -v -e '0.00000  0.00000  0.00000' |grep Page|sed 's/Page \([0-9]*\).*/\1/g'`

ranges=()
for i in ${pages}; do
  if (( $i % 2 )); then
    ranges+=($i-$((i+1)))
  else
    ranges+=($((i-1))-$i)
  fi
done

string=$(printf ",%s" "${ranges[@]}")

string=${string:1}
echo $string