# [NTG-context] How to avoid overriding a control sequence?

Hans Hagen pragma at wxs.nl
Mon Mar 7 21:16:45 CET 2016

On 3/7/2016 7:40 PM, Nicola wrote:
> How do I check in ConTeXt whether a control sequence is already
> defined (to avoid redefining it by accident)?
>
> Marginally related to the above, I have tried to use \show, only to
> discover, to my surprise, that it gives an error. For example:
>
> \show\NL
> \end
>
> Does ConTeXt override some of TeX primitives?

yes, like \month ... but in general if you use uppercase or camelcase
you're quite safe (there are some math symbols with uppercase but if you
define your own commands you will probably not use those) ... mechanisms
like tables that use \NC and so define them local

Hans

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