On Tue, Oct 04, 2022 at 08:38:47PM +0000, Werner LEMBERG wrote: > > I know very little about LuaTeX so don't know how to generate a > > luatex-plain format the way you state, so I have difficulty > > replicating this problem. > > Assuming you have a complete TeXLive installation, you really have > just to call `mtxrun` twice as described above to get the > 'luatex-plain' format. Does it fail for you?
I'm using standard distribution packages on Linux Mint. I don't have a mtxrun command. mtxrun appears to be part of ConTeXt which I don't have installed. Did you check if \openout lines appeared in the log file with the command? luatex --fmt=luatex-plain --file-line-error </dev/null '\input' ./openout.tex
