ls ./presentation.md |entr -c bash -c "pandoc --pdf-engine=xelatex --toc -N presentation.md -t beamer -o presentation.pdf; killall -HUP mupdf"
[1] https://www.systutorials.com/docs/linux/man/1-entr/
[1] https://www.systutorials.com/docs/linux/man/1-entr/