它的各个类和接口为数据流提供了系统输入和输出。
Its various classes and interfaces provide for system input and output for data streams.
对于这个示例，使用数据流操作符输出端的蓝色箭头定义无条件连接。
For this example, define an unconditional connection using the blue arrow on the output port of the data flow operator.
在考虑 > 和 >> 时，认为它们把左边命令的输出数据流移动到右边的目标文件中，这样最容易理解。
When thinking of > and >>, it's easiest to visualize them as the flow of output data moving from the command on the left to the destination file on the right.
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