Both use two standard file descriptors on each end of the connection-one exclusive to read and another exclusive to write operations.
它们在连接的两端使用两个标准的文件描述符—一个只执行读操作，另一个只执行写操作。
As before, end with a period on a line of its own, and use wq to write the file and quit.
与前面一样，各个行使用一个句点结束，并使用wq写入文件并退出。
As before, end with a period on a line of its own, and use wq to write the file and quit.
与前面一样，各个行使用一个句点结束，并使用wq写入文件并退出。
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