如何从文件中获取特定的行 [英] How to get a particular line from a file

问题描述

是否有可能从文件中提取一个知道行号的特定行？例如，只需从文件text.txt中获取行 N 的内容？

解决方案请尝试以下两种解决方案之一：

$ p $ file = File.openfile.txt

＃1解决方案会吃很多RAM
p [* file] [n-1]

＃2解决方案不会
n次{file.gets}
p $ _

file.close


Is it possible to extract a particular line from a file knowing its line number? For example, just get the contents of line N as a string from file "text.txt"?

解决方案

Try one of these two solutions:

file = File.open "file.txt"

#1 solution would eat a lot of RAM
p [*file][n-1]

#2 solution would not
n.times{ file.gets }
p $_

file.close

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