[Kdiff3-user] Problem diffing two directories

[Craig B. <cnb...@sb...>]

I'm having trouble diffing two directories. This is
the command I'm using:

kdiff3 dir1 dir2 -o diff.txt --auto

My problem is that the GUI always appears. The result
displayed in the GUI is correct, though I can see 'Not
available' in the Type column of the right-hand pane
for 'Dest'. The output file (diff.txt) is never
created. I've tried other combinations of switches,
even setting the output (-o) to an existing directory,
but the result is always the same. Doesn't --auto
suppress the GUI? And why is diff.txt never created?

What am I doing wrong?