findstr退出代码/errorlevel

Question

我有一个使用findstr的程序，当找到字符串时，errorlevel返回0，当没有找到字符串时，errorlevel返回1。好的，没问题，我能处理好。

问题的症结在于，我找不到任何关于每个errorlevel对findstr意味着什么的官方文档。我需要知道findstr是否还有其他东西可以返回1的errorlevel，或者当没有找到字符串时，它是否只返回1。

如果有的话，最好是“官方”文档的链接，但如果有任何意见，我们将不胜感激。

提前感谢！

Answer 1

http://ss64.com/nt/findstr.html说：

FINDSTR will set %ERRORLEVEL% as follows:

0 (False) a match is found in at least one line of at least one file.
1 (True) if a match is not found in any line of any file, (or if the file is not found at all).
2 Wrong syntax 
An invalid switch will only print an error message in error stream.

Answer 2

它记录在Dos 6.22的FIND命令的帮助中。

│FIND exit codes
│
│The following list shows each exit code and a brief description of its
│meaning:
│
│0
│    The search was completed successfully and at least one match was found.
│
│1
│    The search was completed successfully, but no matches were found.
│
│2
│    The search was not completed successfully. In this case, an error
│    occurred during the search, and FIND cannot report whether any matches
│    were found.
│
│You can use the ERRORLEVEL parameter on the <If> command line in a batch
│program to process exit codes returned by FIND.