LeetCode OJ：Tenth Line（文件第十行）

How would you print just the 10th line of a file?

For example, assume that file.txt has the following content:

Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10

Your script should output the tenth line, which is:

Line 10

最简单的首先就是使用管道了：

 # Read from the file file.txt and output the tenth line to stdout.
 tail -n+ file.txt | head -n1

先倒序显示第一行到最后一行，然后使用head 来显示第一行。