CMD中单引号和双引号之间的差异 [英] Differences between single and double quotes in CMD

问题描述

我有一个Powershell文件，它替换了配置文件中的IP. Powershell包含三个参数:

I have a powershell file that replaces an IP in a config file. The powershell takes in three parameters:

1. 文件名('C:\Program Files (x86)\app\app.conf')
2. 要替换的IP
3. 新IP

由于我们依赖于为服务使用批处理文件来处理任务，因此我编写了一个批处理脚本，该脚本只接受三个参数并将其发布到powershell脚本中.

Since we are dependent on using a batch file for our service to process the task, I wrote a batch script that simply takes three parameters and posts that to the powershell script.

我们使用批处理文件来调用和解析参数: ($仅用于表示变量)

We use batch file for calling and parsing the parameter: ($ just used to represent variables)

changeip.bat '$filepath' $oldip $newip

这失败了，但是我不明白为什么.我试过在$filepath周围使用双引号而不是单引号，并且有效.

This fails, but I don't understand why. I've tried using double quotes instead of single quotes around $filepath and it worked.

如何用双引号而不是单引号理解$filepath中的空格?

How can the whitespace in $filepath be understood by double quotes and not single quotes?

推荐答案

简短的答案是 CMD不会将单引号当作常规字符来对待.它不是像成对的/成组的双引号.

The short answer is that CMD doesn't treat single quotes as anything but a regular character. It's not a pair/group like double quotes.

单引号具有任何特殊含义的唯一位置是在FOR /F循环中，在该循环中您指定要运行的命令并遍历输出.

The only place where the single quote has any special meaning is in a FOR /F loop, where you are specifying a command to run and iterate over the output.

FOR /F %%d IN ('DIR /S /B C:\Windows') DO @ECHO File: %%d

FOR /F可以选择使用反引号代替，以防您需要将单引号传递给被调用的进程，但这与您的问题无关.

FOR /F has an option to use backticks instead, in case you need to pass single quotes to the called process, but this is unrelated to your question.

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