tail of file的意思|示意

There are two ways to display the lines in a file in reverse order: tac (the reverse of cat) and the command tail -r.

有两种方法可以逆序显示文件中的行：tac(将cat反过来)和tail - r命令。

This tells tail to print the last ten lines of the specified file but, instead of exiting, it waits for more text to appear in the file and prints it as it appears.

该选项告诉tail打印指定文件的最后10行，但是它不仅打印已有的内容，还会等待该文件中将要出现的更多内容，并对其进行打印。

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！