以下是您在man page of the grep command中可以找到的内容：

Exit Status grep exits with one of the following values:
0 One or more lines were selected.
1 No lines were selected.
>1 An error occurred - syntax error in pattern, inaccessible input files, or other system error. In other words a failure to find a matching item is reported as an error (1)

The '-v' option can be used to effectively invert the exit status.

因此，根据您输入的命令，您的问题会有几个答案。如果您需要更多帮助，请使用完整的命令/过程编辑您的帖子。