Difficulty: 简单
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：
1
2
3
4
5
6
7
8
9
10
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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：
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。
Solution
Language: ****
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4
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# Read from the file file.txt and output the tenth line to stdout.
awk 'NR==10{ print $0 }' file.txt
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1
2
3
4
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# Read from the file file.txt and output the tenth line to stdout.
awk '{ if(NR==10){ print $0 } }' file.txt
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1
2
3
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# Read from the file file.txt and output the tenth line to stdout.
sed -n '10p' file.txt
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1
2
3
4
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# Read from the file file.txt and output the tenth line to stdout.
tail -n +10 file.txt | head -n 1
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