链接批处理脚本时出现意外的双“&"号/管道行为 [英] unexpected double ampersand/pipe behavior when chaining batch script

问题描述

我的foo.bat文件:

My foo.bat file:

exit /b 1

我在cmd提示符下执行的操作:

What I execute in a cmd prompt:

foo.bat && echo "OK"

结果:

exit /b 1
"OK"

但是，当我使用双管道时，不会发生回声:

Yet, when I use double pipe, the echo doesn't occur:

foo.bat || echo "OK"

结果:

exit /b 1

这与我期望的完全相反的行为和||去做.请参见 https://ss64.com/nt/call.html ，其中说:

This is the exact opposite behavior of what I expect && and || to do. See https://ss64.com/nt/call.html, where it says:

commandA&& commandB运行commandA，如果成功，则运行commandB

commandA && commandB Run commandA, if it succeeds then run commandB

和

commandA || commandB运行commandA，如果失败，则运行commandB

commandA || commandB Run commandA, if it fails then run commandB

我失去理智了吗?我在这里想念什么?

Am I losing my mind? What am I missing here?

推荐答案

||和&&响应上一条命令(左侧最后执行的命令)的返回代码.无论上下文如何，所有程序都将以错误代码退出.

|| and && respond to the return code of the previous command (the last executed command on the left). All programs exit with an error code, regardless of context.

EXIT /B 1设置批处理ERRORLEVEL，严格来说是cmd.exe概念.

EXIT /B 1 sets the batch ERRORLEVEL, which is strictly a cmd.exe concept.

返回代码和ERRORLEVEL是 相同的东西！

The return code and ERRORLEVEL are not the same thing!

当执行批处理文件时，仅当通过CALL执行了批处理文件时，才将返回的ERRORLEVEL作为返回代码返回.

When a batch file is executed, the exiting ERRORLEVEL is only returned as the return code if the batch file was executed via CALL.

在不执行CALL的情况下执行批处理文件时，&&和||会响应脚本中最后执行的命令.

When a batch file is executed without CALL, && and || respond to the last command executed within the script.

EXIT /B 1将ERRORLEVEL设置为1，但是命令执行成功，因此返回码为0.

EXIT /B 1 sets ERRORLEVEL to 1, but the command executed successfully, so the return code is 0.

使用CALL时，CALL命令在脚本终止后查看ERRORLEVEL，并将返回码设置为ERRORLEVEL.

When CALL is used, the CALL command looks at the ERRORLEVEL after the script terminates, and sets the return code to the ERRORLEVEL.

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