Сгенерировать картинку с математическим выражением

cat /Data/scripts/makeformula 
#!/bin/sh
if [ "$1" = "" ]; then
	echo "usage: makeformula <latex string without \$s>"
	exit
fi
[ "$2" != "" ] && pngname="$2" || pngname="out.png"
mask=tmp_$$
texfile=${mask}.tex
cat > $texfile << EOF
\documentclass[12pt]{minimal}
\usepackage[english, russian]{babel}
\usepackage[koi8-r]{inputenc}
\usepackage[matrix,arrow,curve]{xy}
\usepackage{amsmath}
\usepackage{amsfonts}
\begin{document}
\setbox0=\hbox{$
EOF

echo "$1" >> $texfile

cat >> $texfile << EOF
$}
\textwidth=\wd0
\textheight=\ht0
\advance\textwidth by 2em
\advance\textheight by 2\dp0
\vbox{\vss\hbox{\hss\copy0\hss}\vss}
\end{document}
EOF

latex $texfile
dvipng -D 600 ${mask}.dvi -o $pngname
rm -f ${mask}*