Makes the standard error stream write to the pipe to the multilog process that is already connected to the standard output stream.
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.
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。
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