ok boot -s
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.
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SunOS Release 5.6 Version [UNIX(R) System V Release 4.0]
Copyright (c) 1983-1997, 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 5.6 August 1997
# who -r
   .       run-level S  June 2 07:45     S      0  ?
(Perform some maintenance task)
# Press <Control-d>