By combining head and tail, you can read a chunk of data of the given length from the middle of the file!

通过组合使用head和tail，可以从文件的中间部分读取给定长度的一块数据！

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Listing 2. Check head content of the existing file for these tags.

列表2 .为这些标签核查现有文件中的头内容。

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The head utility prints the first part of each file (10 lines by default).

head工具打印每个文件的最开始部分的内容(默认是10行)。

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So as the particles on the disk that get the current in the read/write head moving put together millions of these magnetized segments and you've got a file.

通过读写头你就可以得到每个粒子的极性,如果把这些上百万粒子的信息,汇聚要一起就够成了一个文件。

哈佛公开课 - 计算机科学课程节选

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