与环和管道DOS批处理脚本 [英] DOS batch script with for loop and pipe

问题描述

我想在文件名不包含单词摘要目录中的所有CSV文件中。里面的命令提示符下，我可以键入以下命令

I would like all the csv files in a directory which filename does not contain word "summary". Inside the command prompt I can type the following command

DIR / B MY_DIR \\ * csv格式。|找到/ V摘要

当我尝试了上面的命令传输到一个批处理文件，我碰上了管道命令一个问题，就是不能在支持循环。这是我不能做以下

When I try to transfer the above command into a batch file I run into a problem in that the pipe command is not supported in the for loop. That is I cannot do the following

FOR /f %%A in ('dir /b my_dir\*.csv | find /V "summary"') do (
rem want to do something here
)

有人可以提供一些线索给我就如何解决上述问题？

Can somebody shed some light to me on how to solve the problem above?

在此先感谢！

推荐答案

您需要躲避 | 字符prevent它是间$ P $在PTED时间的解析循环命令的。使用 ^ 来逃避它：

You need to escape the | character to prevent its being interpreted at the time of parsing the loop command. Use ^ to escape it:

FOR /f "delims=" %%A in ('dir /b "my_dir\*.csv" ^| find /V "summary"') do (
rem do what you want with %%A here
)

一旦逃脱，在 | 变成了 -delimited字符串的一部分。它只是PTED作为特殊符号时该字符串被从环路分别解析，作为子命令，根据语法间$ P $。而做到这一点的之后的解析循环。

Once escaped, the | becomes part of the '-delimited string. It is only interpreted as a special symbol when that string is parsed separately from the loop, as a "sub-command", according to the syntax. And that is done after parsing the loop.

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