（愚蠢地）删除所有变量后，Powershell ISE 无法启动

Question

在我急切地想知道哪些变量是受保护的或常量时，我​​决定看看哪些是可以被删除的——假设上面提到的那些将被单独留下。我没有意识到这些变量的删除不仅限于本次 ISE 会议的范围，而且不仅是 PowerShell 全局的，而且是系统全局的。我希望有人可以帮助我让 ISE 重新工作。

我的愚蠢：

Remove-Variable *  

...导致报告了一堆错误，之后我执行 dir variable: 时只剩下少数 (10-15) 个错误。认为这没什么大不了的，并且重新启动 ISE 会使我恢复正常，我关闭了它 - 我无法再启动它了。

其他症状

从那以后我发现我丢失了诸如环境变量 %windir% 之类的东西 - 这是一个最有趣的转折，阻止您打开高级系统设置（找不到 %windir%\system32\systempropertiesadvanced.exe）来设置您的ENV备份...（是的，我可以直接运行它）

更新：我发现了一个额外的影响/症状：Windows 报告说，在自动更新无法正常工作后，我可能没有正版 Windows。我没有意识到像一些 ENV vars 消失这样简单的事情会杀死它。嗯。

那么 - 任何人都知道如何恢复或重新创建成功运行 ISE 所需的环境？

（是的，我已经尝试删除并重新添加该功能，并结合重新启动。）

Answer 1

我刚才在 ISE 中删除了变量 *，但什么也没发生。我仍然可以打开 ISE 并照常工作。我还做了一个-WhatIf 来查看真正被删除的内容。

PS H:\> Remove-Variable * -WhatIf
What if: Performing operation "Remove Variable" on Target "Name: null".
What if: Performing operation "Remove Variable" on Target "Name: false".
What if: Performing operation "Remove Variable" on Target "Name: true".
What if: Performing operation "Remove Variable" on Target "Name: MaximumErrorCount".
What if: Performing operation "Remove Variable" on Target "Name: MaximumVariableCount".
What if: Performing operation "Remove Variable" on Target "Name: MaximumFunctionCount".
What if: Performing operation "Remove Variable" on Target "Name: MaximumAliasCount".
What if: Performing operation "Remove Variable" on Target "Name: MaximumDriveCount".
What if: Performing operation "Remove Variable" on Target "Name: Error".
What if: Performing operation "Remove Variable" on Target "Name: PWD".
What if: Performing operation "Remove Variable" on Target "Name: ?".
What if: Performing operation "Remove Variable" on Target "Name: MaximumHistoryCount".
What if: Performing operation "Remove Variable" on Target "Name: Host".
What if: Performing operation "Remove Variable" on Target "Name: HOME".
What if: Performing operation "Remove Variable" on Target "Name: ExecutionContext".
What if: Performing operation "Remove Variable" on Target "Name: PSVersionTable".
What if: Performing operation "Remove Variable" on Target "Name: PID".
What if: Performing operation "Remove Variable" on Target "Name: PSCulture".
What if: Performing operation "Remove Variable" on Target "Name: PSUICulture".
What if: Performing operation "Remove Variable" on Target "Name: ShellId".
What if: Performing operation "Remove Variable" on Target "Name: PSHOME".
What if: Performing operation "Remove Variable" on Target "Name: ConsoleFileName".
What if: Performing operation "Remove Variable" on Target "Name: $".
What if: Performing operation "Remove Variable" on Target "Name: ^".
What if: Performing operation "Remove Variable" on Target "Name: StackTrace".
What if: Performing operation "Remove Variable" on Target "Name: OutputEncoding".
What if: Performing operation "Remove Variable" on Target "Name: ConfirmPreference".
What if: Performing operation "Remove Variable" on Target "Name: DebugPreference".
What if: Performing operation "Remove Variable" on Target "Name: ErrorActionPreference".
What if: Performing operation "Remove Variable" on Target "Name: ProgressPreference".
What if: Performing operation "Remove Variable" on Target "Name: VerbosePreference".
What if: Performing operation "Remove Variable" on Target "Name: WarningPreference".
What if: Performing operation "Remove Variable" on Target "Name: ErrorView".
What if: Performing operation "Remove Variable" on Target "Name: NestedPromptLevel".
What if: Performing operation "Remove Variable" on Target "Name: ReportErrorShowExceptionClass".
What if: Performing operation "Remove Variable" on Target "Name: ReportErrorShowInnerException".
What if: Performing operation "Remove Variable" on Target "Name: ReportErrorShowSource".
What if: Performing operation "Remove Variable" on Target "Name: ReportErrorShowStackTrace".
What if: Performing operation "Remove Variable" on Target "Name: WhatIfPreference".
What if: Performing operation "Remove Variable" on Target "Name: FormatEnumerationLimit".
What if: Performing operation "Remove Variable" on Target "Name: PSEmailServer".
What if: Performing operation "Remove Variable" on Target "Name: PSSessionOption".
What if: Performing operation "Remove Variable" on Target "Name: PSSessionConfigurationName".
What if: Performing operation "Remove Variable" on Target "Name: PSSessionApplicationName".
What if: Performing operation "Remove Variable" on Target "Name: psUnsupportedConsoleApplications".
What if: Performing operation "Remove Variable" on Target "Name: PSBoundParameters".
What if: Performing operation "Remove Variable" on Target "Name: args".
What if: Performing operation "Remove Variable" on Target "Name: input".
What if: Performing operation "Remove Variable" on Target "Name: MyInvocation".
What if: Performing operation "Remove Variable" on Target "Name: _".
What if: Performing operation "Remove Variable" on Target "Name: psLocalHelp".
What if: Performing operation "Remove Variable" on Target "Name: psOnlineHelp".
What if: Performing operation "Remove Variable" on Target "Name: psISE".
What if: Performing operation "Remove Variable" on Target "Name: profile".

注意到该列表中的内容非常糟糕。顺便说一句，这些只是 ISE 运行空间中的变量。我不确定删除这些变量会如何阻止 ISE 完全发挥作用。

Answer 2

感谢大家的帮助 - 这就是我所做的，虽然我不确定是否能在所有地方 100% 恢复，但它让我能够使用 ISE、Hyper-V 管理器并再次验证为正版。

我去了另一个 Server 2008 R2 机器，比较密钥并手动编辑注册表并将这些值添加回损坏的机器：

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
  Path=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;
  PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
  PSModulePath=C:\Windows\system32\WindowsPowerShell\v1.0\Modules\
  TEMP=C:\Windows\TEMP
  TMP=C:\Windows\TEMP
  windir=C:\Windows

我倾向于将 ISE 提升的管理员权限作为其影响比会话更大的根本原因。