As a brief note to self, if you need to convert an Asciidoc file named test1.adoc to HTML format, this command works:
asciidoc -o test1.html test1.adoc
Of course a key here is that you need the
asciidoc command installed. I installed it on my Mac with Homebrew, something like
brew install asciidoc.
(It may also be possible to do this conversion with Pandoc, but I didn’t have any initial success with it.)