convert latex formula to jpeg image

tex2jpg.sh

#!/bin/bash

# usage: echo '$$E=mc^2$$' | tex2jpg out.jpg

PPWD=$(pwd)
DIR=/tmp/$(head -c10 /dev/urandom | base32)
mkdir -p $DIR

cd $DIR && \
    echo '\documentclass{minimal}' > input.tex && \
    echo '\begin{document}' >> input.tex && \
    echo '' >> input.tex && \
    cat >> input.tex && \
    echo '' >> input.tex && \
    echo '\end{document}' >> input.tex && \
    cat input.tex && \
    latex input.tex && \
    magick convert  -density 300 input.dvi -trim -bordercolor white -border 20 out.jpg && \
    cd $PPWD && \
    cp $DIR/out.jpg $1

rm -rf $DIR