There's already an su-like tool: auth/login (excercise for the reader:
alter auth/login to allow the host owner to switch without providing a
password). You can also switch users more violently with the cons
filesystem (/dev/hostowner).
su is already exist that allow the host owner to switch without
providing a password.
I wrote:
If you do want something like UNIX su command,
try
http://plan9.aichi-u.ac.jp/netlib/cmd/su-1.4/
su is useful if you want instantaneously change your user ID.
Kenji Arisawa
