03-10-2019
Thanks VBE for the quick reply . The issue is there is no way to get to command line during the startup or shutdown process. To startup all you do is power the IBM T30 laptop with all interface connected and it goes thru the SCO and Oracle 7 startup and the BMW GT1 menu appears. To shutdown all you do is once you end all diagnostic back to Main menu , you enter Ctrl+Alt+F1 and type "shut" at the logon promot. It then goes thru the shutdown process and powers off the T30.
Is there a way to safely interrupt the startup and go into single user mode and do a DD command. There is no time the system even goes to command line .
rgds
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LEARN ABOUT OPENSOLARIS
shutdown
shutdown(1B) SunOS/BSD Compatibility Package Commands shutdown(1B)
NAME
shutdown - close down the system at a given time
SYNOPSIS
/usr/ucb/shutdown [-fhknr] time [warning-message]...
DESCRIPTION
shutdown provides an automated procedure to notify users when the system is to be shut down. time specifies when shutdown will bring the
system down; it may be the word now (indicating an immediate shutdown), or it may specify a future time in one of two formats: +number and
hour:min. The first form brings the system down in number minutes, and the second brings the system down at the time of day indicated in
24-hour notation.
At intervals that get closer as the apocalypse approaches, warning messages are displayed at terminals of all logged-in users, and of users
who have remote mounts on that machine.
At shutdown time a message is written to the system log daemon, syslogd(1M), containing the time of shutdown, the instigator of the shut-
down, and the reason. Then a terminate signal is sent to init, which brings the system down to single-user mode.
OPTIONS
As an alternative to the above procedure, these options can be specified:
-f Arrange, in the manner of fastboot(1B), that when the system is rebooted, the file systems will not be checked.
-h Execute halt(1M).
-k Simulate shutdown of the system. Do not actually shut down the system.
-n Prevent the normal sync(2) before stopping.
-r Execute reboot(1M).
FILES
/etc/rmtab remote mounted file system table
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
fastboot(1B), login(1), halt(1M), reboot(1M), syslogd(1M), sync(2), rmtab(4), attributes(5)
NOTES
Only allows you to bring the system down between now and 23:59 if you use the absolute time for shutdown.
SunOS 5.11 11 Oct 1994 shutdown(1B)