在Windows中，什么是2℃之间的差;＆放大器1和2 - ;＆放大器; 1？ [英] In Windows, what's the difference between 2<&1 and 2>&1?

问题描述

本页面的例子和解释离开我困惑：

The examples and explanations in this page are leaving me confused:

<一个href=\"http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true\">http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true

有没有使用2℃之间的任何实际差别;放大器＆; 1和2>＆安培; 1？第二种形式（2>＆安培; 1）。是我熟悉的，从与Unix外壳工作

Is there any practical difference between using 2<&1 and 2>&1? The second form (2>&1) is familiar to me, from working with the Unix shell.

以上链接的页面有：

要找到FILE.TXT，然后重定向处理1（即STDOUT）和手柄2（即STDERR）到Search.txt，类型：结果
  findfile file.txt的> search.txt 2';＆放大器; 1

To find File.txt, and then redirect handle 1 (that is, STDOUT) and handle 2 (that is, STDERR) to the Search.txt, type:
findfile file.txt>search.txt 2<&1

和也

要重定向所有的输出，包括手柄2（即STDERR），从ipconfig命令来处理1（即STDOUT），然后重定向输出中以Output.log，类型：结果
  IPCONFIG.EXE >> output.log 2>＆安培; 1

To redirect all of the output, including handle 2 (that is, STDERR), from the ipconfig command to handle 1 (that is, STDOUT), and then redirect the ouput to Output.log, type:
ipconfig.exe>>output.log 2>&1

在最后，是那里的结果有什么区别？

In the end, is there any difference in the results?

推荐答案

一些例子应该显示会发生什么：

Some examples should show what happens:

c:\YourDir> cd FolderNotHere > nul
The system cannot find the path specified. 

您得到错误流

c:\YourDir>cd FolderNotHere > nul  2>&1

您得到什么，错误流去肚里为null STD输出流。

You get nothing, the error stream goes to the std output stream which goes to null.

c:\YourDir>cd > nul

您得到什么，输出流去空。

You get nothing, the output stream goes to null.

c:\YourDir>cd > nul 1>&2
c:\YourDir

您获得已发送到错误流，因此它不会被重定向性病outout。

You get the std outout which has been sent to the error stream so it doesn't get redirected.

c:\YourDir>cd > nul 1<&2

这个接缝做一样的1>和2

This seams to do the same as 1>&2

这篇关于在Windows中，什么是2℃之间的差;＆放大器1和2 - ;＆放大器; 1？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！