Hi,
I would create a powershell script to shutdown the host, rather than a batch file. Install the VMware PowerCLI onto a Windows server and connect to your host/vCenter. If you want a batch file, I guess you could create the powershell script and then execute it from a batch file? I don;t know why you'd want that though!
Then you can use the VMware Documentation center and find out the commands to shutdown your server. You will use the stop-VMHost cmdlet in doing this.
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Regards,
Ryan
vExpert, VCP5, VCAP5-DCA, MCITP, VCE-CIAE, NPP4
@vRyanH
http://vRyan.co.uk