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

Nicola nvitacolonna at gmail.com
Mon Mar 7 21:30:51 CET 2016

On 2016-03-07 20:16:45 +0000, Hans Hagen said:

> 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

I see. Local commands are a good idea. I usually use camelcase, but
since I wanted to define some two-letter sequences, I thought I'd
better be cautious.

Nicola