This question already has an answer here:
As written in the page below,
lualatex seems to be a symbolic link or an lias to
Difference between luatex and lualatex binaries
However, they don't work the same way.
lualatex compiles latex format documents while
luatex compiles plain tex documents.
This means they are not the same 'UNIX executable' or
lualatex isn't just an alias of
luatex. Why do they work differently?
Thank you in advance.