如何输入多行命令 [英] How to enter a multi-line command

问题描述

是否可以将PowerShell命令行分成多行?

Is it possible to split a PowerShell command line over multiple lines?

在Visual Basic中，我可以使用下划线(_)在下一行继续该命令.

In Visual Basic I can use the underscore (_) to continue the command in the next line.

推荐答案

您可以在空格后面加上重音符号(反引号):

You can use a space followed by the grave accent (backtick):

Get-ChildItem -Recurse `
  -Filter *.jpg `
  | Select LastWriteTime

但是，仅在上述情况下才需要这样做.通常，当命令在语法上无法完全完成时，您会获得自动的行连续性.这包括启动一个新的管道元素:

However, this is only ever necessary in such cases as shown above. Usually you get automatic line continuation when a command cannot syntactically be complete at that point. This includes starting a new pipeline element:

Get-ChildItem |
  Select Name,Length

将正常工作，因为在|之后，该命令由于缺少另一个管道元素而无法完成.同样，打开花括号或任何其他种类的括号也可以直接继续行:

will work without problems since after the | the command cannot be complete since it's missing another pipeline element. Also opening curly braces or any other kind of parentheses will allow line continuation directly:

$x=1..5
$x[
  0,3
] | % {
  "Number: $_"
}

类似于|的逗号在某些情况下也可以使用:

Similar to the | a comma will also work in some contexts:

1,
2

请紧记，类似于JavaScript的自动分号插入，有些情况也类似，因为换行符发生在 前面带有有效语句的位置:

Keep in mind, though, similar to JavaScript's Automatic Semicolon Insertion, there are some things that are similarly broken because the line break occurs at a point where it is preceded by a valid statement:

return
  5

不起作用.

最后，字符串(在所有变体中)也可能会超出一行:

Finally, strings (in all varieties) may also extend beyond a single line:

'Foo
bar'

然后，它们在字符串中包含换行符.

They include the line breaks within the string, then.

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