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English Version

题目描述

给定一个文本文件 file.txt,请只打印这个文件中的第十行。

示例:

假设 file.txt 有如下内容:

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

你的脚本应当显示第十行:

Line 10

说明:
1. 如果文件少于十行,你应当输出什么?
2. 至少有三种不同的解法,请尝试尽可能多的方法来解题。

解法

Bash

# Read from the file file.txt and output the tenth line to stdout.
tail -n +10 file.txt | head -1
# Read from the file file.txt and output the tenth line to stdout.
awk 'NR == 10' file.txt
# Read from the file file.txt and output the tenth line to stdout.
sed -n 10p file.txt