Long before there was Markdown, there was a similar Unix tool. I remember reading about it before the Internet was popular, probably mid-to-late 1980s. I may have read about it in “Communications of the ACM”.<div dir="auto"><div dir="auto"><br></div><div dir="auto">It was designed to let secretaries compose memos, without learning the dot commands of troff or nroff. If you indented a space or two, it started a new paragraph. If you indented several spaces, it centered the line; very similar to Markdown in concept. It generated a file that could be fed into troff.</div><div dir="auto"><br></div><div dir="auto">I was thinking it might have been part of the System V Documentors Workbench, but I read through the doc for it and could not find anything like that.</div><div dir="auto"><br></div><div dir="auto">Does anyone remember this?</div><div dir="auto"><br></div><div dir="auto">Thanks!</div></div>