On 2013–04–20 Tim Li wrote:

> Marco, many thanks. By the way, how can I load the
> `luatex-plain.fmt` by default when typing "luatex somefile.tex"?   

TeX checks for a format which is named the same as the binary. You
can create a link:

  ln -s /path/to/binary/luatex luatex-plain

and then call

  luatex-plain somefile.tex

and it'll use the format “luatex-plain”.


Marco