用Ruby读取前一行文件 [英] Reading previous line of file with Ruby

问题描述

如何阅读文件的主要行。与IO.gets.I相反，我最初认为将IO.lineno设置为我想要读取的行号，但这并不像预期的那样工作。你如何阅读上一行？

How to read the prevous line of a file. The opposite of IO.gets.I initially thought to set IO.lineno to the line number I wanted to read but that doesn't work as expect. How do you actually read the previous line?

推荐答案

一种简单的方法是记住你读过的上一行：

One simple way is to remember the previous line you read:

prev = nil
File.foreach('_vimrc') do |line|
  p [line, prev]  # do whatever processing here
  prev = line
end

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