Updating reboot's default

From: Warner Losh <imp_at_bsdimp.com>
Date: Tue, 21 Jun 2022 14:01:58 UTC
15 or 20 years ago, we talked about changing the default for reboot from
'right now' to being safe shutdown. There were arguments made against it
due to tiny appliances and such.

Time has past, and this oddity has persisted. It's time to revisit that

I'd propose that we keep 'fastboot' and 'fasthalt' having the immediate
behavior. However, the 'reboot' command will switch from '-q' behavior to
'-r' behavior.

I'll update the man page, etc to reflect these new defaults. Most of the
systems I've been on in the last 10-15 years have had some flavor of 'alias
reboot reboot -r' in their login scripts and/or made shell scripts that did
this. This will match what everybody else is doing, and will likely result
in less astonishment rather than more, even though it changes a
long-standing default behavior.