Default behaviour of 'ifconfig'

[Marc Balmer <marc%msys.ch@localhost>]

A cursory check on the Unix systems I run, including some Linux boxen,
revealed that all of them but NetBSD have 'ifconfig', when called
without arguments, default to the behaviour of 'ifconfig -a', which
seems both natural and handy to me.

Is there a particular reason NetBSD does not do this?  If the only
reason is "lack of diff" I am more than willing to do the work.

- Marc