The init command is an executable shell script that terminates all active processes on a system and then synchronizes the disks before changing run levels. Specifying run level 0 shuts down the OS and displays the OpenBoot prompt.
# init 0
# svc.startd: The system is coming down. Please wait.
svc.startd: 126 system services are now being stopped.
Sep 21 13:31:31 systemA.xxxxx.com syslogd: going down on signal 15
svc.startd: Killing user processes.
Sep 21 13:31:37 The system is down. Shutdown took 23 seconds.
syncing file systems... done
Program terminated
SPARC S7-2, No Keyboard
...
{0} ok