pdfsplit

This allows you to split a pdf from the copier into separate documents: 

#!/bin/bash
#
# pdfsplit [input.pdf] [original_page_count] [pages_per_document] [output_name]
#
# Example: pdfsplit input.pdf 48 4 output
# Result: creates files output1.pdf, output2.pdf, ..., output12.pdf
#

if [ $# -lt 4 ]
then
  echo "Usage: pdfsplit [input.pdf] [original_page_count] [pages_per_document] [output_name]"
  exit 1
fi
i=1
fpage=1
lpage=$3
while [ $fpage -lt $2 ]; do
  gs -dBATCH -dNOPAUSE -sOutputFile="$4$fpage.pdf" -dFirstPage=$fpage -dLastPage=$lpage -sDEVICE=pdfwrite "$1" >& /dev/null
  echo "wrote $4$fpage.pdf"
  fpage=$(($fpage + $3))
  lpage=$(($lpage + $3))
done