要在分配动态变量不起作用时调用表达式[重复]

Question

此问题已经在这里有了答案：

• How do I pass a local variable to a remote `Invoke-Command`?2个答案

我的任务是连接到其他VM并执行某些任务，.....并传递任务参数。我为此使用Invoke-Expression，.....现在，当我直接在invoke-expression中传递静态路径时，效果很好，但是当我将其分配给varible并追加到invoke-expression时。它不起作用

我尝试通过提供静态路径来正常工作，并在远程虚拟机上执行批处理，问题是路径是动态的

  Static is working fine has shown below:

  $server="slc10XXX.XX.XXXX.com"
  $username="XXXXXXX"
  $password="XXXXXX@321"
  $pass = ConvertTo-SecureString -AsPlainText $password -Force
  $cred = New-Object System.Management.Automation.PSCredential - 
  ArgumentList $username, $pass
  $path="cmd.exe /c C:\Task6-MASSUOW\chay.bat"
  Invoke-Command -ComputerName $server -credential $cred -ErrorAction Stop 
  -ScriptBlock {Invoke-Expression -Command:"cmd.exe /c C:\Task6- 
  MASSUOW\chay.bat"}

  Getting issue in below code when i assign $path:

  $server="slc10XXX.XX.XXXX.com"
  $username="XXXXXXX"
  $password="XXXXXX@321"
  $pass = ConvertTo-SecureString -AsPlainText $password -Force
  $cred = New-Object System.Management.Automation.PSCredential - 
  ArgumentList $username, $pass
  $path="cmd.exe /c C:\Task6-MASSUOW\chay.bat"
  Invoke-Command -ComputerName $server -credential $cred -ErrorAction Stop 
  -ScriptBlock {Invoke-Expression -Command:"$path"}

PowerShell.exe：无法将参数绑定到参数'Command'，因为它为空。在第1行：char：1+ PowerShell.exe -ExecutionPolicy绕过-File'C：\ Users \ chaj \ Documents ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~+ CategoryInfo：未指定：（无法绑定arg ...，因为它为null。：String）[]，RemoteException+ FullyQualifiedErrorId：NativeCommandError在C：\ Users \ chaj \ Documents \ String \ Chat1.ps1：8 char：1+调用命令-ComputerName $ server -credential $ cred -ErrorAction S ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~+ CategoryInfo：InvalidData：（:) [Invoke-Expression]，ParameterBindingValidationException+ FullyQualifiedErrorId：ParameterArgumentValidationErrorNullNotAllowed，Microsoft.PowerShell.Commands.InvokeExpressionCommand+ PSComputerName：slc10XXXX.XX.XXXX.com

Answer 1

这是因为"$path"作为字符串文字发送到了远程服务器。该表达式将在此处求值，但在远程会话中未定义$path。这就是为什么它为空的原因。

例如，您可以这样做：

Invoke-Command -ComputerName $server -Credential $cred -ErrorAction Stop -ScriptBlock {
   param($path)
   Invoke-Expression -Command:$path
} -ArgumentList "cmd.exe /c C:\Task6-MASSUOW\chay.bat"

或更简单：

Invoke-Command -Script { & $Args[0] } -Arg "C:\Task6-MASSUOW\chay.bat" -Computer $server -Cred $cred -EA Stop