英文:
Use environment variables to identify a directory in Powershell
问题
In a Powershell script, you can create a directory using the domain and user name from environment variables like this:
New-Item -Path "c:\Users\$($env:UserDomain)_$($env:UserName)" -ItemType Directory
This command will create a directory in the format "c:\Users\FOOBAR_kilroy" based on the values of the "UserDomain" and "UserName" environment variables.
英文:
New to Powershell.
In a Powershell script, I'm trying to create a directory using the domain and user name as pulled from environment variables. So for domain\user "FOOBAR\kilroy" I want to create something like c:\Users\FOOBAR_kilroy.
I've tried
"c:\Users$(env:UserDomain)"+"_"+"$(env:UserName)";
"c:\Users$env:UserDomain"+"_"+"$env:UserName"; and
"c:\Users\env:UserDomain_$(env:UserName)".
All the above generate an error.
What am I missing?
答案1
得分: 1
在一个可展开的（双引号）字符串（"..."）中：
-
您可以嵌入甚至是_带有命名空间限定_的变量引用，例如
$env:USERDOMAIN原样。 -
但是，与任何嵌入的变量引用一样，将（可能带有命名空间限定的）名称封装在
{...}中（例如${env:USERDOMAIN}）可能是必要的，以区分变量名称与_后续字符_，例如您的情况下的_，因为_是 PowerShell 变量名称的一部分_不需要_用{...}封装。
因此：
"c:\Users${env:USERDOMAIN}_$env:USERNAME"
英文:
In an expandable (double-quoted) string ("..."):
-
You can embed even namespace-qualified variable references such as
$env:USERDOMAINas-is.- Enclosure in
$(...), the subexpression operator is only needed for expressions and commands, such as$($env:USERDOMAIN.Length),$($args[0]),$(1 + 2), or$(Get-Date)- see this answer for a comprehensive overview of PowerShell's string interpolation.
- Enclosure in
-
However, as with any embedded variable reference, enclosure of the (potentially namespace-qualified) name in
{...}(e.g.${env:USERDOMAIN}) may be necessary in order to disambiguate variable names from subsequent characters, such as_in your case, given that_is a character that can be part of a PowerShell variable name without enclosure in{...}.
Therefore:
"c:\Users${env:USERDOMAIN}_$env:USERNAME"
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