A Linux one-liner to run a command when a file in a directory tree is created,
modified or deleted. Uses inotifywait from the inotify-tools package.
while inotifywait -e modify,create,delete -r .; do echo "file changed"; done
This is easy but annoying to look up. When I asked an LLM, it omitted the
recursive flag (-r) unless I explicitly asked for it.