On 2013–08–27 "H. Özoguz" wrote:

> For LaTex there exists a tool, named "latexmk", which allows a
> "preview continuous mode", that is to update the compiled pdf
> automatically. It is really very helpful!

I don't know latexmk, but updating the pdf is a feature of the pdf
reader, not of context. If you want to re-run the compilation when
the file has changed, you can use the mechanisms your operating
system provides. Every OS has a mechanism to watch files. Here is a
Linux example

  while true do
    inotifywait --event modify somefile.tex; context --batchmode somefile.tex
  done

Marco