[NTG-context] Equivalent of os.resultof(...) in LaTeX

[Xan]

On Mon, 3 Nov 2014 14:31:17 +0100
Xan <dxpublica at telefonica.net> ha escrit:

> It does not work:> \documentclass{article}
> > \begin{document}
> > \directlua{
> >  local handle = io.popen("sha256sum \jobname.tex | cut -c -5","r")
> >  if handle then
> >    local result = handle:read("*all") or ""
> >    handle:close()
> >    tex.print(result)
> >  end
> > }
> > \end{document}
> 
> Neither this:
> 
> > \directlua{
> >  require "lualibs-os"
> >  tex.sprint(os.resultof("sha256sum \jobname.tex | cut -c  -5"))
> > }
> 
> 
> Blank. Nothing displayed.