PowerShell 的调用运算符 (&) 语法和双引号 [英] PowerShell's call operator (&) syntax and double-quotes

问题描述

有人可以向我解释这个结果吗?多年来，我浪费了大量时间试图掌握 PowerShell 的调用命令语法，但是这……我什至无法猜测如何从输入中获得这个结果.

Can someone explain this result to me? I've wasted a lot of time over the years trying to master PowerShell's syntax for calling commands, but this...I can't even make a guess how to get this result from the input.

PS C:\Users\P> & echoargs "   ""1"" 2 3 ""4 5 6""   7 8 9"
Arg 0 is <   1 2 3 4>
Arg 1 is <5>
Arg 2 is <6   7 8 9>

布勒?

推荐答案

双引号字符串中的双引号是插入双引号的一种方式.echoargs.exe 的更新版本更清楚地显示了这一点，因为它向您显示了用于调用 exe 的命令行:

The doubled-up doubles quotes inside a double-quoted string is a way to insert a double quote. The updated version of echoargs.exe shows this a bit more clearly as it shows you the command line used to invoke the exe:

PS>  echoargs "   ""1"" 2 3 ""4 5 6""   7 8 9"
Arg 0 is <   1 2 3 4>
Arg 1 is <5>
Arg 2 is <6   7 8 9>

Command line:
"C:\...\Modules\Pscx\Apps\EchoArgs.exe"  "   "1" 2 3 "4 5 6"   7 8 9"

如果你使用那个命令行(在它被 PowerShell 解析之后)你会在 CMD.exe 中得到相同的结果:

If you take that command line (after it has been parsed by PowerShell) you get the same result in CMD.exe:

CMD> EchoArgs.exe "   "1" 2 3 "4 5 6"   7 8 9"
Arg 0 is <   1 2 3 4>
Arg 1 is <5>
Arg 2 is <6   7 8 9>

Command line:
C:\...\Modules\Pscx\Apps\EchoArgs.exe  "   "1" 2 3 "4 5 6"   7 8 9"

至于为什么 .NET 或 C++ 启动代码以这种方式解析命令行，我不完全确定.这个 MSDN 主题 对此进行了一些介绍如果您查看主题底部的示例，您会看到一些同样奇怪的解析行为，例如a\\\bd"ef"gh 给出 a\\\b、de fg 和 h.

As to why .NET or the C++ startup code parses the command line that way, I'm not entirely sure. This MSDN topic covers it a bit and if you look at the examples at the bottom of the topic, you will see some equally weird parsing behavior e.g. a\\\b d"e f"g h gives a\\\b, de fg and h.

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