批：退出code为＆QUOT; RD＆QUOT;在误差为0，以及 [英] batch: Exit code for "rd" is 0 on error as well

问题描述

我正在写一个批处理（.bat）脚本，我需要处理，其中一个文件夹的删除失败的情况下。我使用％ERRORLEVEL％赶出境code，但在 RD的情况下命令它似乎不工作：

I'm writing a batch (.bat) script and I need to handle the case in which the deletion of a folder fails. I'm using %errorlevel% to catch the exit code, but in the case of the rd command it seems not to work:

C:\Users\edo\Desktop>rd testdir
Directory is not empty

C:\Users\edo\Desktop>echo %errorlevel%
0

为什么呢？你有什么建议？结果
谢谢！

Why? What do you suggest?
Thanks!

推荐答案

哇，这是我见过的第二个情况ERRORLEVEL没有设置正确！请参见文件重定向在Windows和％ERRORLEVEL％。

Wow, this is the 2nd case I've seen where ERRORLEVEL is not set properly! See File redirection in Windows and %errorlevel%.

的解决方案是一样用于检测重定向失败。使用 || 运营商采取在失败的行动。

The solution is the same as for detecting redirection failure. Use the || operator to take action upon failure.

rd testdir || echo The command failed!

在离奇的事情是，当你使用 || 运算符，ERRORLEVEL然后正确设置为145，如果该文件夹不为空，或者2如果文件夹没有不存在。所以，你甚至不需要做任何事情。你可以有条件地执行一听这话，并且ERRORLEVEL将被正确设置。

The bizarre thing is, when you use the || operator, the ERRORLEVEL is then set properly to 145 if the folder was not empty, or 2 if the folder did not exist. So you don't even need to do anything. You could conditionally "execute" a remark, and the errorlevel will then be set properly.

rd testdir || rem
echo %errorlevel%

更新2016年1月21日

早在2015年四月，安德烈亚斯Vergison中声称评论|| 没有设置为拒绝访问，或者ERRORLEVEL ......在使用。 ..的错误。我的Windows 7的时候，我不认为我验证了他的说法，只是认为他是正确的。但我已经在Windows 10最近测试，而 || 总是在错误设置ERRORLEVEL为非零。需要注意的是（呼叫）是迫使ERRORLEVEL为0，我每次运行命令之前的神秘方式。另外请注意，我的CMD.EXE会议已经推迟扩张启用。

Back in April of 2015, Andreas Vergison claimed in a comment that || did not set the ERRORLEVEL for "Access Denied", or "...In Use..." errors. I had Windows 7 at the time, and I don't think I verified his claim, but just assumed he was correct. But I have recently tested in Windows 10, and the || always sets the ERRORLEVEL to non-zero upon error. Note that (call ) is an arcane way of forcing the ERRORLEVEL to 0 before I run each command. Also note that my cmd.exe session has delayed expansion enabled.

C:\test>(call ) & rd junk && echo OK || echo ERROR !errorlevel!
Access is denied.
ERROR 5

C:\test>(call ) & rd test && echo OK || echo ERROR !errorlevel!
The directory is not empty.
ERROR 145

C:\test>(call ) & rd \test && echo OK || echo ERROR !errorlevel!
The process cannot access the file because it is being used by another process.
ERROR 32

C:\test>(call ) & rd notExists && echo OK || echo ERROR !errorlevel!
The system cannot find the file specified.
ERROR 2

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