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diff --git a/concat_pdfs.sh b/concat_pdfs.sh
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+#!/bin/bash
+# Copyright (C) 2017 Ryan Kavanagh <rkavanagh@cs.cmu.edu>
+# Takes all pdf files (at most 4 directories deep)
+# and concatenates them in a PDF, such that each
+# PDF starts on an odd numbered page (useful for when
+# you want to print all student submissions double-sidedly)
+#
+# Puts the filename in the top right corner of the page.
+
+TMPDIR=`mktemp -d`
+TEXFILE="${TMPDIR}/all.tex"
+
+cat<<EOF>${TEXFILE}
+\documentclass[twoside]{minimal}
+\usepackage[letterpaper,top=0.25in,left=0.5in,right=0.5in,bottom=0.5in]{geometry}
+\usepackage{pdfpages}
+\usepackage{cprotect}
+\makeatletter
+\def\ps@headings{
+\def\@oddfoot{}\def\@evenfoot{}
+\def\@oddhead{}\def\@evenhead{}
+}
+\makeatother
+\includepdfset{pages=-,pagecommand={\pagestyle{headings}}}
+\pagenumbering{gobble}
+\begin{document}
+\cleardoublepage
+EOF
+
+c=0;
+shopt -s nullglob # kill the globs that don't match
+for pdf in */*.pdf */*/*.pdf */*/*/*.pdf */*/*/*/*.pdf;
+do
+    # We should also check that the file ${pdf} is non-empty
+    # Here, sometimes students submit PDF files that gs accepts, but which
+    # pdfpages doesn't like. Having gs rewrite the PDF fixes this.
+    # We can also convert all of the submitted PDFs to grayscale to save
+    # colour ink.
+    mutool clean `pwd`"/${pdf}" `pwd`"/${pdf}" 
+    gs -o "${TMPDIR}/${c}.pdf" \
+	-sDEVICE=pdfwrite \
+	-dPDFSETTINGS=/prepress \
+	-sColorConversionStrategy=Gray \
+	-dProcessColorModel=/DeviceGray \
+	-dCompatibilityLevel=1.4 \
+	`pwd`"/${pdf}"
+    ESCAPED=`echo "${pdf}" | sed -e 's:&:\\\\&:g;s:\\$:\\\\$:g;s:%:\\\\%:g;s:_:\\\\_:g'`
+    cat<<EOF>>${TEXFILE}
+\makeatletter
+\renewcommand{\@oddhead}{\hfill ${ESCAPED}}
+\renewcommand{\@evenhead}{\hfill ${ESCAPED}}
+\makeatother
+\includepdf{${TMPDIR}/${c}.pdf}
+\cleardoublepage
+EOF
+    c=`expr "${c}" + 1`
+done
+
+cat<<EOF>>${TEXFILE}
+\end{document}
+EOF
+pdflatex ${TEXFILE}
+pdflatex ${TEXFILE}
+
+rm -fr ${TMPDIR}