singularity.sh

#!/usr/bin/env bash

echo '\documentclass{article}\begin{document}Lorem ipsum dolor sit amet\end{document}' > input.tex
pdflatex input

size=$(cat input.pdf | wc -c)
old_size=0

while [[ $old_size -lt $size ]]; do
  echo '\documentclass{article}\begin{document}' > input.tex
  cat input.pdf | base64 >> input.tex
  echo '\end{document}' >> input.tex

  pdflatex input

  old_size=$size
  size=$(cat input.pdf | wc -c)
done