Backported patch from Eric Cooper <ecc@cmu.edu> for iftop >= 0.17, which
ensures that the -b option turns off the bar display as the man page says.
For further information, please have a look to Debian bug ID #445991.

--- iftop-0.17/options.c		2010-11-18 22:59:02.031875252 +0100
+++ iftop-0.17/options.c.bar-display	2010-11-18 23:07:12.312900377 +0100
@@ -302,7 +302,7 @@
                 break;
 
             case 'b':
-                config_set_string("show-bars", "true");
+                config_set_string("show-bars", "false");
                 break;
 
             case 'B':