这是什么在Windows批处理文件中？ [英] What is this in a windows batch file?

问题描述

我用谷歌搜索了，我读过，我空白了。我正在编辑批处理文件以进行批量SVN转储和加载。正如所有优秀的开发人员所做的那样，我有一个我获得的脚本，但我想了解所有这些。基本上，脚本遍历存储库列表：

I've googled, I've read, I'm coming up blank. I'm editing a batch file to do a mass SVN dump and load. As all good developers do, I have a script that I acquired, but I'd like to understand all of it. Basically, the script iterates through the list of repositories:

FOR /F %%G IN ('dir /b /ad %repodir%') DO ^
SET dumpfile=%%G.dump
ECHO Starting SVN dump for %%G... >> %repolog% & ^

svnadmin dump %repodir%%%G > %repotdirdump%%%G & ^

问题 - 请参阅插入符号和& ^？这些怎么办？这是for循环的定义方式吗？



谢谢

The question - See the caret and the "& ^"? What do these do? Is this how the for loop is defined?

thanks

推荐答案

奇怪 - '&'是通常用作



statement1&statement2



意味着statement2将在statement1之后运行



那么你可以有



statement1 && statement2



（注意double &&） - 哪个iirc意味着statement2只有在statement1成功时才会运行



到目前为止很好..插入符号'^'通常'逃脱'字符跟随它，也就是说，停止由shell解释的角色，但从某种意义上说，你发现我很难理解



你可以课程使用



... DO（

声明1

..

声明

）



但这可能会改变意图的含义 - 对不起，我无法帮助更多查理，这已经很久很久了（一个d即使在我们的时间，我们也有相当复杂的批处理脚本）

its odd - '&' is usually used as

statement1 & statement2

meaning statement2 will run after statement1

then you can have

statement1 && statement2

(note double &&) - which iirc means statement2 will run only if statement1 is successful

so far so good.. the caret aka '^' usually 'escapes' the character following it, that is, stops the character being interpreted by the shell, but in the sense you've shown I find it hard to make sense of

you can of course use

...DO (
statement1
..
statementn
)

but that might change the meaning of what's intended - sorry I cant help more Charlie, its been a long, long time (and we had quite sophisticated batch scripts even for our time)

你知道，我认为你正在做些什么。我认为这有点像延续。 ^是转义字符，它允许忽略新行 - 我认为。

You know, I think you're on to something. I think it's sort of like a continuation. The "^" is the escape character, and it's there to allow ignoring the new line- I think.

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