Currently, the display mode can be toggled between "One line per host",
"Received traffic only", "Sent traffic only" and "Two lines per host":

  - either by pressing the "t" key,
  - or by setting the "line-display" parameter in the config file.

It would be very useful to have a way to specify this through a
command-line option, like it's currently possible with most other
frequently-used iftop's adjustments.
Debian Release: 5.0
  500 testing         apt-proxy.i4
--- Package information. ---
Depends                   (Version) | Installed
===================================-+-====================
libc6                    (>= 2.7-1) | 2.7-16
libncurses5     (>= 5.6+20071006-3) | 5.7+20081213-1
libpcap0.8             (>= 0.9.3-1) | 0.9.8-5