Shell Script which uses pdflatex to stitch pdf files together

pdftack.sh

#!/bin/bash
######################################################################
# Copyright (c) 2012 Maximilian Ruta <mr@xtain.net>                  #
#                                                                    #
# Permission is hereby granted, free of charge, to any person        #
# obtaining a copy of this software and associated documentation     #
# files (the "Software"), to deal in the # Software without          #
# restriction, including without limitation the rights to use, copy, #
# modify, merge, publish, distribute, sublicense, and/or sell        #
# copies of the Software, and to permit persons to whom the          #
# Software is furnished to do so, subject to the following           #
# conditions:                                                        #
#                                                                    #
# The above copyright notice and this permission notice shall be     #
# included in all copies or substantial portions of the Software.    #
#                                                                    #
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,    #
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES    #
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND           #
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT        #
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,       #
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, #
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER      #
# DEALINGS IN THE SOFTWARE.                                          #
######################################################################

if [ "${#}" -eq 0 ]; then
  echo "Usage: pdftack [files] > out.pdf"
fi;
DIR=$(mktemp -d)
PAGES=("$@")
PAGESSTR=""
for ((i=0;i<${#};i++))
do
  echo "${PAGES[${i}]}"
  if [ "${PAGES[${i}]}" -a -r "${PAGES[${i}]}" ]; then
    FILE=$(readlink -f "${PAGES[${i}]}")
    PAGESSTR=$(cat <<EOF
${PAGESSTR}
\includepdf[pages=-]{${FILE}}
EOF
)
  fi;
done
cd "${DIR}"
pdflatex --jobname=out > /dev/null <<EOF
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{pdfpages}
\begin{document}
${PAGESSTR}
\end{document}
EOF
if [ -r "out.pdf" ]; then
  cat out.pdf
fi;
rm -R "${DIR}"