使用Ruby替换文件中的特定行 [英] Replace a specific line in a file using Ruby

问题描述

我有一个文本文件(a.txt)，如下所示.

I have a text file (a.txt) that looks like the following.

open
close
open
open
close
open

我需要找到一种方法将第三行替换为"close".我做了一些搜索，大多数方法都涉及搜索行而不是替换行.因为我不想将所有的打开"都变成关闭"，所以在这里真的不能做到.

I need to find a way to replace the 3rd line with "close". I did some search and most method involve searching for the line than replace it. Can't really do it here since I don't want to turn all the "open" to "close".

基本上(对于这种情况)我正在寻找IO.readlines("./a.txt")[2]的写入版本.

Essentially (for this case) I'm looking for a write version of IO.readlines("./a.txt") [2].

推荐答案

诸如此类的事情

lines = File.readlines('file')
lines[2] = 'close' << $/
File.open('file', 'w') { |f| f.write(lines.join) }

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