Yes, the question I'm asking is simplistic to the extreme. I'm sorry about that. I'm not a Linux expert, certainly not from a system admin point of view, so I've got to ask a very simple question. We have a Centos system here, which we're not really responsible for. At the moment I've got 5 other servers taking power on a precarious UPS. I want to shut down the Centos system to help alleviate things, while we work to get the new UPS. I've gone to the Centos monitor, and it looks to me as though it's simply a process of clicking on the "Shut down" link on the lower right. Is there anything else, or will that do?
closed as off topic by Tom O'Connor♦, Iain Mar 21 '12 at 22:12
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Yes - the "shutdown" button will do what you expect it to. You may be prompted for administrator credentials before the shutdown will proceed.
Needless to say, you'll lose access to any data or applications that are on that server.
With regards to starting things back up, whether or not applications start back up automatically is completely dependent on how the server is configured, so YMMV.
It is very simple to shut down and power up Linux systems, in the general case. It is remotely possible that something odd has been done that will cause you trouble, but unlikely, and absolutely not the default.
Other than clicking the "shut down" link, you can use the command line
Booting should just be a matter of turning on the system - it should come up without any human intervention at all.