无法使用cd前进 [英] Unable to move forward using cd

问题描述

在使用PowerShell前进时遇到问题。我可以上移目录，但不能下移。情况如下：

I'm having a problem moving forward through a path with PowerShell. I am able to move up the directory but not down. Here's the situation:

我打开PowerShell，然后输入 pwd命令，它显示我当前在 PS C：\Users\Robert Inspiron14>

I open PowerShell and type in the "pwd" command and it shows that I am currently in PS C:\Users\Robert Inspiron14>

我键入命令 cd。。现在我移到 PS C：\Users>

I type the command "cd.." and now I move to PS C:\Users>

然后我尝试通过键入以下内容来更改目录： cd C：\Users\Robert Inspiron14；我无法。不幸的是，由于缺乏声誉，我还无法发布图片。

I then attempt to change directories by typing: "cd C:\Users\Robert Inspiron14" and I am unable to. Unfortunately, I can't post a picture yet due to lack of reputation.

我可以在CMD中执行更改，但无法在PowerShell中执行更改。另外，我不知道如何将用户从 Robert Inspiron14更改为只是罗伯特。

I'm able to perform the change in CMD but not PowerShell. Also, I don't know how to change the User from "Robert Inspiron14" to just "Robert". Any help is appreciated!

推荐答案

以补充 Mathias R. Jessen的有用答案，其中提供了更多背景信息：

To complement Mathias R. Jessen's helpful answer with more background information:

引用包含空格的参数是常规在所有壳 中使用语法是必要的，因为 未加引号的空间用于分隔多个参数 。

Quoting an argument that contains spaces is a general syntactic necessity, in all shells, because unquoted spaces are used to separate multiple arguments.

不仅需要引用的空格，而且PowerShell的任何所谓的元字符 （不带引号的字符具有语法功能）；例如，将路径传递到名叫 a; b 的目录也需要引用，因为; 否则被解释为语句分隔符。

It isn't only spaces that require quoting, but any of PowerShell's so-called metacharacters (characters that, when used unquoted, have syntactic function); for instance, passing the path to a directory literally named a;b requires quoting as well, given that ; would otherwise be interpreted as a statement separator.

有多个引用样式 ：

There are multiple quoting styles:

• 由于您的路径是文字路径-它不包含变量引用或表达式-'...' -quoting（单 -quoting）是最佳选择。
  
  使用 ... -quoting（ double -quoting），如果您的路径包含变量或子表达式，即，如果您需要可扩展字符串（插值字符串）。 [ 1]

有关PowerShell中字符串文字的概述，请参见此答案。

• Since your path is a literal path - it contains no variable references or expressions - '...'-quoting (single-quoting) is the best choice.
  Use "..."-quoting (double-quoting) if your path contains variables or subexpressions, i.e. if you need an expandable string (interpolating string).^[1]
  See this answer for an overview of string literals in PowerShell.

另一种较不常见的解决方案是单独使用`，PowerShell的转义字符： cd C：\Users\R注意Inspiron14

Another, less common solution is to individually escape the space characters with `, PowerShell's escape character: cd C:\Users\Robert` Inspiron14

也请注意：

• PowerShell的选项卡完成会根据需要自动应用引用。

• PowerShell's tab completion automatically applies quoting as necessary.

cd .. 是PowerShell中内置的 function 的名称，目的是模拟 cmd.exe 的（可能是允许的）行为（如下所示）；该函数执行语法正确的 Set-Location .. 调用（通过执行 $ {function：cd ..} 进行验证），并用空格将命令名与其参数分开。

cd.. is the name of a built-in function in PowerShell, whose sole purpose is to emulate cmd.exe's (questionably permissive) behavior (see below); the function performs a syntactically correct Set-Location .. call (verify by executing ${function:cd..}), with a space separating the command name from its argument.

不幸的是， cmd.exe '内置的 cd 命令决定不强制执行其通常的语法规则，以及启用的调用，例如 cd C：\程序文件。

Unfortunately, cmd.exe's built-in cd command decided not to enforce its usual syntax rules, and enabled calls such as cd C:\Program Files.

它不应该这样做：虽然方便乍一看，它构成了通常的规则中引起混乱的问题异常。

请注意， cmd.exe ' s 制表符完成正确地引用了包含空格的参数。

It should never have done that: While convenient at first glance, it constitutes a problematic exception from the usual rules that invites confusion.
Note that cmd.exe's tab completion properly quotes arguments that contain spaces.

类似地， cd .. 是不幸的是，作为正确的 cd .. 的语法例外替代方式-请参见有关详细信息，请参见此答案。

Similarly, cd.. was unfortunately allowed as as syntactically exceptional alternative to the correct cd .. - see the comments on this answer for details.

^{[1]注意如果在路径中使用 variable 引用，则严格不需要 ... 引用，只要任何 literal 组件都不需要引用；例如， $ HOME\foo 可以不加引号，而 在附近; $ HOME\foo bar 是必需的。使用 subexpressions （ $（...） ），规则变得更加复杂，因此最简单的方法是始终始终使用 ......}

^{[1] Note "..."-quoting isn't strictly necessary if you use variable references in a path, as long as any literal components do not require quoting; e.g., $HOME\foo is fine without quoting, whereas the " around "$HOME\foo bar" are required. With subexpressions ($(...)), the rules get more complicated, so the simplest approach is to always use "..."-quoting with them.}

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