[luatex] read and write streams

[Markus Kohm]

Am Donnerstag, 19. November 2015, 18:48:53 schrieb jfbu:
> to be
> robust with respect to future enlargement of output streams for this task ?

\newrite\terminal
\immediate\write\terminal{Test}

As long, as you do not open the new write, it will write to terminal and log 
file. BTW: For LaTeX you should simply use \typeout. So for generic code you 
may use something like:

\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname typeout\endcsname\relax
  \newwrite\@typeout
  \def\typeout{\immediate\write\@typeout}
\fi
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