So generally, if you don't get an error message in a command line environment like this, that's good.

一般来说，如果你在命令行界面,没有收到错误信息，那就是好消息。

哈佛公开课 - 计算机科学课程节选

Other pesky problems are confusing file names, command and error messages, the PC's notorious and so far intractable complexity, and inadequate protection of privacy.

CNN: Is anyone listening to Bill Gates' theory on the PC's future?

But if the dir command results in the error message "Invalid drive specification, " go back and try again.

CNN: Top 50 Windows tips

Both countries have limited command and control structures, and neither has developed the technology to recall a nuclear-tipped missile fired in error.

BBC: NEWS | South Asia | Pakistan tests mid-range missile