Passing variables on invocation- and reading them in ConTEXt

[Ian Lawrence <physics.rooted@gmail.com>]

A feeble request from me, again.

I'd like to pass variables into context on invocation, just as you can do with setting modes

So

context --arguments="number=8", "time=full-time" --mode=trial test.tex

And have the values of the variables show up in the body of the text, so:
----
\starttext

Hello world

% This is \getvariables{arguments}{number} it. % this does not work - what do I need here to write out the next line?

This is 8.

% This is \getvariables{arguments}{time} it. % Nor does this - what do I need here to write out the next line?

This is full-time.

\stoptext
----


As ever, I've trawled the manuals and wiki and archive emails (which is where the construct --arguments="number=8" came from.)

Thanks in anticipation

Ian
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