On Mon, Mar 7, 2016 at 7:40 PM, Nicola <nvitacolonna@gmail.com> wrote:

> How do I check in ConTeXt whether a control sequence is already
> defined (to avoid redefining it by accident)?
>
>
kind of

\ifdefined\writebanner \else \unexpanded\def\writebanner{\writestring}
\fi
?



-- 
luigi