在执行更名主机或添加域操作后，为了使设置生效需要重启计算机。为此需要使用Win32_OperatingSystem WMI类的shutdown()和reboot()方法，要执行的操作由向脚本传递的参数-a确定，值为s则关机；为r则重启。为了顺利地关机或重启所用账户必须具有相应的权限，将EnablePrivileges的属性设置为$true。
需要注意的是如果执行关机和重启操作的主机是本机，则需要两次定义Get-WmiObject，分别为出示凭据和不需要使用凭据的情况。如果操作的主机不是本机，则需要使用备用凭据，此脚本的代码如下：
param(
$computer="localhost",
$user = "administrator",
$password,
$a,
$help
)
function funHelp()
{
$helpText=@"
DESCRIPTION:
NAME: ShutdownRebootComputer.ps1
Shutdown or reboot a local or remote machine.
ARAMETERS:
-computer Specifies the name of the computer upon which to run the script
-user user credentials
-password password of the user
-a(ction) action to perform < s(hutdown), r(eboot) >
-help prints help file
SYNTAX:
ShutdownRebootComputer.ps1 -computer WebServer -a s
Shutdown a remote computer named WebServer
ShutdownRebootComputer.ps1 -computer WebServer -a r
-user WebServer\admin -password MyPassword
Reboots a computer named WebServer. Uses the credentials
of the WebServer admin, with password of MyPassword
ShutdownRebootComputer.ps1
Displays message pointing to help
ShutdownRebootComputer.ps1 -help ?
Displays the help topic for the script
"@
$helpText
exit
}
if($help){ "Obtaining help …" ; funhelp }
switch($a)
{
"s" {
if($computer -ne "localhost")
{
$objWMI = Get-WmiObject -Class Win32_operatingsystem `
-computername $computer -credential $user
$objWMI.psbase.Scope.Options.EnablePrivileges = $true
$objWMI.shutdown()
}
ELSE
{
$objWMI = Get-WmiObject -Class Win32_operatingsystem `
-computername $computer
$objWMI.psbase.Scope.Options.EnablePrivileges = $true
$objWMI.shutdown()
}
}
"r" {
if($computer -ne "localhost")
{
$objWMI = Get-WmiObject -Class Win32_operatingsystem `
-computername $computer -credential $user
$objWMI.psbase.Scope.Options.EnablePrivileges = $true
$objWMI.reboot()
}
ELSE
{
$objWMI = Get-WmiObject -Class Win32_operatingsystem `
-computername $computer
$objWMI.psbase.Scope.Options.EnablePrivileges = $true
$objWMI.reboot()
}
}
DEFAULT { "You must supply an action. Try this"
"ShutdownRebootComputer.ps1 -help ?" }
}
执行此脚本调用命令.\ShutdownRebootComputer.ps1 –a s和.\ShutdownRebootComputer.ps1 –a r，分别对应当前系统的关闭和重启。关机和重启操作在本地计算机上可以直接执行，而远程计算机需要指定相应的参数，其中-computer指定主机名；-user指定用户；-password指定用户密码。
为了避免误运行该脚本关闭或重启计算机，将默认操作设置为显示帮助字符串，并要求用户在提供-help参数的情况下才能运行该脚本的帮助信息。
作者: 付海军
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