UNIX for Advanced & Expert Users

This is a foolish action which is quite likely to damage your data and can result in a system which never works again.

Btw. CentOS is Linux variant. It is not unix.

However if this is a proper server with a management card it should be possible to control the power switch with remote management software (however stupid this action may be). If it is just a PC, not a hope short of using Internet-controlled power switches (which are available).

Hi,

If you are brave you could try the "uadmin" system call - should be pretty quick although not sure if the call exists in AIX.

Code:

uadmin 1 0	Don't sync drop system to {ok} prompt instantly.
uadmin 1 6	Don't sync and power off the system instantly.

Just remember if it's not commited to disk it's gone and if you are in a production environment, your probably gone too!

Regards

Dave

If you can put a remote console card in the system.

For Dell this would be iDRAC
HP would be iLO

You can do cold power off, come back later when you feel like it and power on.

If your HW supports it, wakeonlan could be another option.

That's because runlevel 5 on Linux is multiuser-mode with console GUI, while on Solaris it means shutdown plus poweroff.

You could try poweroff (or halt -p). Equivalent of the BSD shutdown -p. Should power any machine that understands the system call to power down.

This is CentOS. Let's stick to commands which definitely work on CentOS.