On 2013–08–27 Marco Patzer wrote:

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

Better:

  file='somefile.tex'
  while inotifywait --event modify "$file"; do
    context --batchmode "$file"
  done

For BSDs/MacOS: http://en.wikipedia.org/wiki/Kqueue
For Windows:    http://schneider.ncifcrf.gov/atchange.html

Marco