dlurl : 术语 'dlurl' 未被识别为 cmdlet、函数、脚本文件或可运行程序的名称

Question

我是 powershell 的新手，运行遇到了一个奇怪的错误：

\Downloads> dlurl = "https://s3.amazonaws.com/aws-cli/AWSCLI64PY3.msi"
dlurl : The term 'dlurl' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ dlurl = "https://s3.amazonaws.com/aws-cli/AWSCLI64PY3.msi"
+ ~~~~~
    + CategoryInfo          : ObjectNotFound: (dlurl:String) [], CommandNotFoundException

有什么建议吗？

Answer 1

与 POSIX 兼容的 shell 不同，例如 Bash，PowerShell 在 创建 [=41 时也需要使用 $ 前缀符号=]（分配给）变量，不只是在获取它们的值时。

因此：

$dlurl = "https://s3.amazonaws.com/aws-cli/AWSCLI64PY3.msi"

^{注意：考虑对逐字内容使用'...'字符串。}

如果没有 $，dlurl 将被解释为 命令名称 以及其后的所有内容作为其参数，它解释了您看到的错误（您的系统上不存在该名称的命令）。

另请参阅：

概念性 about_Variables 帮助主题。

about_Parsing, which explains PowerShell's two fundamental parsing modes, argument mode (shell-like), and expression mode (programming-language-like); it is the first token of a statement that determines what mode is entered. A more systematic overview can be found in .

dlurl : 术语 'dlurl' 未被识别为 cmdlet、函数、脚本文件或可运行程序的名称

dlurl : The term 'dlurl' is not recognized as the name of a cmdlet, function, script file, or operable program

variables

syntax

powershell