在Linux中，管道是一种使用非常频繁的通信机制。从本质上说，管道也是一种文件，但它又和一般的文件有所不同，管道可以克服使用文件进行通信的两个问题。-In Linux, the pipeline is a very frequent use of the communication mechanism. In essence, the pipeline is a file, but it is different, and general files, pipes can be used to overcome two problems communicating documents.