ok boot -s
.
.
.
SunOS Release 5.7 Version [UNIX(R) System V Release 4.0]
Copyright (c) 1983-1998, Sun Microsystems, Inc.
configuring network interfaces: le0.
Hostname: mars
INIT: SINGLE USER MODE
Type Ctrl-d to proceed with normal startup,
(or give root password for system maintenance): xxx
Sun Microsystems Inc.   SunOS 5.7 August 1998
# who -r
  .       run-level S  Jun 10 15:34     S      0  ?
(Perform some maintenance task)
# Press <Control-d>