stderr是标准错误流，显示命令中的错误输出。
stderr is the standard error stream, which displays error output from commands.
让标准错误流写入到multilog进程的管道，这个管道已经连接到了标准输出流。
Makes the standard error stream write to the pipe to the multilog process that is already connected to the standard output stream.
有一点不是很重要但却很有帮助，初始打开每个应用程序时，都具有三个文件描述符，从0到2，分别表示标准输入、输出和错误流。
As a bit of helpful trivia, each application is initially opened with three file descriptors, 0 through 2, for the standard input, output, and error streams, respectively.
如果您仔细观察，那么可能会发现，前面的这些示例中并没有出现标准错误(stderr)流。
If you've been paying attention, you've probably noticed that the standard error (stderr) stream isn't represented in any of those examples.
标准C库（因而，每个UNIX程序）定义了三种标准流：输入、输出和错误。
The standard C library (and thus, every UNIX program) defined three standard streams: input, output, and error.
主要的详细的错误信息出现在标准输出流中，这样就可以和其它输出交织在一起，用来为错误分析提供帮助。
Primary detailed error messages appear on standard output stream so that it is properly interlaced with other output, thus aiding error analysis.
码流的测试根据DVBETR290标准提供的关于码流测试的相关规定，对传输流进行监测，并提供详细的错误信息报告。
Further more, according to DVB ETR290, the system is accomplished to monitor the transport stream and give the detailed description for the error information.
这个函数通常用于打开一个指定的文件使用预先定义的流：标准输入，标准输出，标准错误。
This function is typically used to open a specified file as one of the predefined streams: standard input, standard output, or standard error.
这个函数通常用于打开一个指定的文件使用预先定义的流：标准输入，标准输出，标准错误。
This function is typically used to open a specified file as one of the predefined streams: standard input, standard output, or standard error.
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