在 Ruby 中的文件中查找并替换

发布于 2024-11-27 16:16:33 字数 390 浏览 0 评论 0原文

我有一个用 ruby 编写的小程序。我在这里找到了一段很好的代码，用于查找和替换文件中的某些内容，但它似乎不起作用。代码如下：

#!/usr/bin/env ruby

DOC = "test.txt"
FIND = /,,^M/
SEP = "\n"

#make substitution
File.read(DOC).gsub(FIND, SEP)

#Check if the line already exist
unique_lines = File.readlines(DOC).uniq

#Save the result in a new file
File.open('test2.txt', 'w') { |f| f.puts(unique_lines) }

谢谢大家！

原文

I have this little program I write in ruby. I found a nice piece of code here, on SO, to find and replace something in a file, but it doesn't seems to work.
Here's the code:

#!/usr/bin/env ruby

DOC = "test.txt"
FIND = /,,^M/
SEP = "\n"

#make substitution
File.read(DOC).gsub(FIND, SEP)

#Check if the line already exist
unique_lines = File.readlines(DOC).uniq

#Save the result in a new file
File.open('test2.txt', 'w') { |f| f.puts(unique_lines) }

Thanks everybody !

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半城柳色半声笛 2024-12-04 16:16:33

我会跳过检查该行是否已存在的操作，并且通常会使用类似的内容（这里我想用“BAR”替换“FOO”）：

full_path_to_read = File.expand_path('~/test1.txt')
full_path_to_write = File.expand_path('~/test2.txt')

File.open(full_path_to_read) do |source_file|
  contents = source_file.read
  contents.gsub!(/FOO/, 'BAR')
  File.open(full_path_to_write, "w+") { |f| f.write(contents) }
end

expand_path 的使用也可能是这里有点迂腐，但我喜欢它，这样我就不会意外地破坏一些我无意的文件。

I skip the check you make to see if the line already exists and usually go with something like this (here I want to replace 'FOO' with 'BAR'):

full_path_to_read = File.expand_path('~/test1.txt')
full_path_to_write = File.expand_path('~/test2.txt')

File.open(full_path_to_read) do |source_file|
  contents = source_file.read
  contents.gsub!(/FOO/, 'BAR')
  File.open(full_path_to_write, "w+") { |f| f.write(contents) }
end

The use of expand_path is also probably a bit pedantic here, but I like it just so that I don't accidentally clobber some file I didn't mean to.

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