通过'@'提供输入文件会出现错误:斜线运算符'@'不能用于引用表达式中的变量 [英] Supplying an input file via '@' gives an error: The splatting operator '@' cannot be used to reference variables in an expression

问题描述

在此示例以下 https://docs.microsoft.com/zh-CN/cli/azure/vm/run-command?view=azure-cli-latest

运行命令时出现错误

az vm run-command invoke  --command-id RunPowerShellScript --name win-vm -g my-resource-group --scripts @script.ps1

错误:

拼写运算符'@'不能用于引用表达式中的变量."@script"只能用作命令的参数.要在表达式中引用变量，请使用"$ script".

The splatting operator '@' cannot be used to reference variables in an expression. '@script' can be used only as an argument to a command. To reference variables in an expression use '$script'.

将其放在引号中只会传递引号中的内容，而不会传递脚本的内容.

Putting it in quotes only passes in the contents in the quotes, not the contents of the script.

推荐答案

注意:

• 此答案说明如何转义/引用 @ 字符.正确地.

如果您的命令行仅包含 verbatim 自变量-即，仅文字标记，而不是PowerShell 变量引用(例如， $ file )或表达式(例如，($ dir +'\ script.ps1'))-您可以替换地放置-％，停止传递符号，位于传递参数之前，如 Wasif Hasan的答案;请注意，仍然会扩展 cmd.exe 样式的变量引用，例如％FOO％.

If your command line only contains verbatim arguments - i.e., only literal tokens, not PowerShell variable references (e.g, $file) or expressions (e.g., ($dir + '\script.ps1')) - you can alternatively place --%, the stop-parsing symbol, before the pass-through arguments, as shown in Wasif Hasan's answer; note that cmd.exe-style variable references such as %FOO% are still expanded, however.

@ 是PowerShell中的元字符 (具有句法含义的字符 ^[1] )，因此在为了将其 verbatim 传递给 az ，您必须引用整个参数，或者`-转义 @ 单独:

@ is a metacharacter in PowerShell (a character with syntactic meaning^[1]), so in order to pass it verbatim through to az you must either quote the whole argument or `-escape the @ individually:

具有 literal 脚本文件名:

# Either: `-escape the @
az ... --scripts `@script.ps1

#`# Or: quote the whole argument
# Use '...' for a literal argument.
az ... --scripts '@script.ps1'

脚本文件名存储在变量中， $ file :

With the script filename stored in a variable, $file:

# Either: `-escape the @
az ... --scripts `@$file

#`# Or: quote the whole argument
# Use "..." for an argument with variable references, i.e. an expandable string
az ... --scripts "@$file"

注意:在可变的情况下，您可以仅仅使用 @ $ file ，但是考虑到这对任何字符都不起作用. other 而不是 @ 之后的 $ ，最好养成始终引用/转义逐字 @ 的习惯

Note: You could get away with just @$file in the variable case, but given that that doesn't work with any char. other than $ following the @, it's better to get into the habit of always quoting / escaping a verbatim @.

^{[1] @ 有几种语法用法，具体用法取决于接下来要使用的字符.在您的情况下， @ script.ps1 中的 @ 被解释为}

^{[1] @ has several syntactic uses, and the specific use depends on what character comes next. In your case, the @ in @script.ps1 was interpreted as the splatting operator with a variable named script, with the .ps1 part interpreted as an attempt to access a property named ps1 on that variable - hence the error message.}

这篇关于通过'@'提供输入文件会出现错误:斜线运算符'@'不能用于引用表达式中的变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！