Utility for attaching files inside PDF

This utility creates a PDF file containing specified files embedded into
it as attachments. The attachments can be extracted from the PDF file by
using extr utility.
I placed this in a separate "utils" directory to signify that this is
NOT intended to run on a Kindle (it requires pdfLaTeX to generate the
PDF file) but only on the desktop Linux workstation.

utils/pdfattach

@@ -0,0 +1,76 @@
+#!/bin/bash
+
+#
+# pdfattach --- embed specified file(s) in a specified PDF file
+# Requires pdfLaTeX and attachfile.sty package to run
+# Returns 0 on success or >0 on error
+#
+# Written by Tigran Aivazian <tigran@bibles.org.uk>
+#
+
+progname=$(basename $0)
+
+function usage()
+{
+	echo "Usage: $progname -o file.pdf -i file1.djvu [-i file2.mp3] ..."
+	exit 1
+}
+
+if (! getopts ":o:i:" opt); then
+	echo "$progname: Missing options." >&2
+	usage
+fi
+
+declare outfile=""
+declare -a infiles=()
+declare -i infcount=0 outfcount=0
+
+while getopts ":i:o:" opt; do
+	case $opt in
+	o)
+		outfile="$OPTARG"
+		outbase=$(basename $outfile | cut -d'.' -f1)
+		targetdir=$(dirname $outfile)
+		((outfcount++))
+		;;
+	i)
+		infiles[$infcount]=$(readlink -f "$OPTARG")
+		((infcount++))
+		;;
+	\?)
+		echo "$progname: Invalid option: -$OPTARG" >&2
+		usage
+		;;
+	:)
+		echo "$progname: Option -$OPTARG requires an argument." >&2
+		usage
+		;;
+	esac
+done
+
+if ((infcount == 0)) ; then
+	echo "$progname: No input file(s) specified." >&2
+	usage
+fi
+
+if ((outfcount != 1)) ; then
+	echo "$progname: One (and only one) output file must be specified." >&2
+	usage
+fi
+
+
+workdir=$(mktemp --tmpdir -d pdfattach.XXXXXX)
+cd $workdir
+> ${outbase}.tex
+echo -E "\documentclass{book}" >> ${outbase}.tex
+echo -E "\usepackage{attachfile}" >> ${outbase}.tex
+echo -E "\begin{document}" >> ${outbase}.tex
+echo -E "\pagestyle{empty}" >> ${outbase}.tex
+for ((i = 0 ; i < ${#infiles[*]} ; i++));
+do
+	echo "\attachfile{${infiles[$i]}}" >> ${outbase}.tex
+done
+echo -E "\end{document}" >> ${outbase}.tex
+pdflatex -halt-on-error ${outbase} > /dev/null && mv ${outbase}.pdf $targetdir
+cd - > /dev/null
+rm -rf $workdir