Andrew Brown writes:
> >Not true.  There may be more than one address per interface in each
> >/etc/ifconfig.xxx file.  Also, not every address is an IP address.
[...]
> interfaces with more than one address?  like ppp interfaces?

Like all interfaces. There are machines these days with dozens of IP
addresses running on one interface, and IPv6 goes so far as to
institutionalize this, requiring that an interface respond to a number
of differing addresses.

> addresses that are not ip addresses?  check $af to see if it says
> "inet" before you add the route.

Parsing begins to become a serious pain.

Perry