I managed to screw up root already, doing

chsh -s usr/pkg/bin/bash root

which of course doesn't exist (no leading "/").  When I log in to root 
or su to root, I am immediately sent back to "login:"  or back to my 
user prompt since root doesn't have a valid shell.

Do I have to reboot in single user mode to fix this, or is there a way 
to correct this within NetBSD as it is currently running?