On Fri, 22 Feb 2019, Fabrice L wrote:

> Dear list,
>
> I wish to do several zoom from a picture made in MetaFun, from a pdf file
> which name is given on the commande line, like:
>
> context zoom.tex —File=EntryFile —Page=9 —result=OutFile.pdf

Untested. Add quotes around FileName:

> string FileName ;
> FileName := "\getdocumentargument{File}" ;

Aditya