我在变量中有环境变量的名称，我想获取该值。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
两行
$v = "Path"
(get-item env:$v).Value
One line
iex ('$env:' + $x)
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