adm
admin
ann
anon
anonymous/anonymous
backup
batch
bin
checkfsys
daemon
demo
diag
field
ftp
games
guest/guest   guest/anonymous
help
install
listen
lp
lpadmin
maint
makefsys
mountfsys
network
news
nobody
nuucp
nuucpa
operator
powerdown
printer
pub
public
reboot
rje
rlogin
root
sa
setup
shutdown
startup
sync
sys/sys
sysadm
sysadmin
sysbin/sysbin   sysbin/bin
sysman
system
tech
test
trouble
tty
umountfsys
user/user   user1/user1
uucp
uucpa
visitor