使用PowerShell返回环境变量的值

Question

我在变量中有一个环境变量的名称，我想得到这个值。我怎么做？我试过了：

PS C:\Users\Joe> $v="USERDOMAIN"
PS C:\Users\Joe> "$env:$v"
At line:1 char:2
+ "$env:$v"
+  ~~~~~
Variable reference is not valid. ':' was not followed by a valid variable name character. Consider using ${} to
delimit the name.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : InvalidVariableReferenceWithDrive

PS C:\Users\Joe> "$env:$($v)"
At line:1 char:2
+ "$env:$($v)"
+  ~~~~~
Variable reference is not valid. ':' was not followed by a valid variable name character. Consider using ${} to
delimit the name.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : InvalidVariableReferenceWithDrive

Answer 1

两行

$v = "Path"
(get-item env:$v).Value

一行

iex ('$env:' + $x)

Answer 2

使用直接使用.NET框架的解决方案来补充Vladimir's helpful answer：

$v="USERDOMAIN"
[Environment]::GetEnvironmentVariable($v) 

Answer 3

我相信你可以省略引号：

$v = "USERDOMAIN"
$env:$v