Re: wait until the file is done

[MN]

Thank you so much for your help.
I chose what Greg Wooledge suggested.
(inotify-tools package is currently not available on my machine.)

This is how the function looks like:
I somewhat touched it, so let me know if I seriously messed it up.
(The numbers are lowered for testing purposes
and the echo will be removed too)

  waitfor() { 
  oldsize=0

  while sleep 3; do
    size=$(wc -c < "$1")
    if ((size > oldsize)); then
      oldsize=$size
      SECONDS=0
      echo 'new loop'
      continue
    fi
    if ((SECONDS > 10)); then
      break
    fi
  done
  }

It worked as expected. As soon as the video was processed, there was no 
more 'new loop' lines and I got my prompt back in 10s.

(Shutdown line was removed from the function. I prefer to add it 
manually in case I want to do different task, like hibernating)