为什么不“设置-P"?管后工作? [英] Why doesn't "set -P" work after a pipe?

问题描述

C:\>type c:\output.txt
abcd
C:\>type c:\output.txt | set /p V1=

C:\>set
... A bunch of junk, NOT seeing "V1"

发生了什么事?根据我看到的所有SET文档，应该从上面为％V1％分配一个值"abcd"，不是吗?

What happened? According to all documentation for SET I've seen, %V1% should have been assigned a value of "abcd" from the above, no?

如果有问题，我正在使用Windows XP Pro SP3.

I'm on Windows XP Pro, SP3 if it matters.

推荐答案

管道似乎创建了一个新的CMD实例，以执行下一个接收管道数据的命令.因此，当管道结束时，该CMD实例将退出并且该变量将丢失.

The pipe seems to create a new CMD instance to carry out the next command that is receiving the pipe data. So when the pipe has concluded, that CMD instance exits and the variable is lost.

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