scrolling a TextView

[Fabio Marzocca <thesaltydog gmail com>]

I have a textview packed into a scrolledwindow. The textview buffer is
linked  to a pipe to display output lines from a spwned process. I
need the textview to scroll down while text is inserted in the buffer,
otherwise I can't follow the lines. In other words, how to keep in
synchro the textview with the scroll, while text is added?