RUBY-如果文件不存在，如何将文件复制到特定目录

我认为这是一个非常简单的问题，但我被卡住了

我正在尝试编写一个脚本来查找第一个目录，然后检查第二个目录以查看是否有匹配的文件。如果文件匹配，我需要将文件从第二个目录复制到第三个目录，前提是它们在第三个目录中不存在

这是我到目前为止所拥有的东西的副本。代码仍然覆盖第三个目录中的文件，即使它们已经存在。我做错了什么

谢谢

#!/usr/bin/ruby

require 'FileUtils'

library_path_1 = ARGV[0]
library_path_2 = ARGV[1]
library_path_3 = ARGV[2]

dir_1 = Dir.glob(library_path_1 + "/**/*").select{ |x| File.file? x }
dir_2 = Dir.glob(library_path_2 + "/**/*").select{ |x| File.file? x }
destination = Dir.glob(library_path_3 + "/**/*").select{ |x| File.file? x }

dir_1.each do |filename|
  dir_2.each do |path|
    destination.each do |existing_file|

      existing_file = File.basename(existing_file)

      if path.include?(File.basename(filename))
        FileUtils.cp(path, library_path_3) unless File.exists?(existing_file)
      end

    end
  end
end

---

似乎您只是通过文件名验证文件，但您必须通过全名检查文件，如下所示：

existing_file = File.basename(existing_file)

if path.include?(File.basename(filename))
   FileUtils.cp(path, library_path_3) unless File.exist?(File.join(library_path_3, existing_file))
end

---

以下是根据@Cary Swoveland的答案编写的最终脚本。谢谢大家

require 'FileUtils'

library_path_1 = ARGV[0]
library_path_2 = ARGV[1]
library_path_3 = ARGV[2]

# check the managed media folder for files, look in original capture scratch for all files in managed media.
# if files in managed media exist in original capture scratch, copy them to the destination folder.

managed_media_folder = Dir.glob(library_path_1 + "/**/*").select{ |x| File.file? x }
original_capture_scratch = Dir.glob(library_path_2 + "/**/*").select{ |x| File.file? x }
destination = Dir.glob(library_path_3 + "/**/*").select{ |x| File.file? x }

bn = managed_media_folder.map { |fn| File.basename fn } - destination.map { |fn| File.basename fn }
original_capture_scratch.each do |fn| 
  if bn.include? File.basename(fn)
    puts fn
    FileUtils.cp(fn, library_path_3) 
  end
end

---

谢谢全名是指我需要检查文件的完整路径吗？File.join在这里做什么？@MaileThiesen它在文件之前附加第三个文件夹路径name@MaileThiesen

glob

返回相对于库路径的文件名（路径）。调用

File.exist？

而不预先指定该路径（这就是

join

所做的），检查该文件是否存在于当前目录中。@Stefan是的，在当前目录中，但您说它在任何情况下都会重写一个文件，如果它也存在于第三个文件夹中@МаъСъъъъ“您说它在任何情况下都会重写一个文件”是吗？对不起，我不理解您的评论：-）顺便说一句，

File.exists？

已被弃用，您应该使用

File.exist？

谢谢，Stephan！我改了。除了目标目录中的覆盖问题外，它似乎正在工作。这成功了！当我在目录名中添加'destination.map'和下划线时。非常感谢你！谢谢你的帮助，梅勒。

dir_1.each do |file|
  filename = File.basename(file)
  if exists_in_dir2?(filename) && exists_in_dir3?(filename) == false
    copy_to_destination(filename) 
  end
end

def copy_to_destination(filename)
    File.copy(filename, "#{library_path_3}/{filename}")
end

def exists_in_dir2?(filename)
    dir_2.each do |path|
        path.include?("#{filename}")
    end
end

def exists_in_dir3?(filename)
    destination.each do |existing_file|
        File.exist?("#{filename}")
    end
end

require 'FileUtils'

library_path_1 = ARGV[0]
library_path_2 = ARGV[1]
library_path_3 = ARGV[2]

# check the managed media folder for files, look in original capture scratch for all files in managed media.
# if files in managed media exist in original capture scratch, copy them to the destination folder.

managed_media_folder = Dir.glob(library_path_1 + "/**/*").select{ |x| File.file? x }
original_capture_scratch = Dir.glob(library_path_2 + "/**/*").select{ |x| File.file? x }
destination = Dir.glob(library_path_3 + "/**/*").select{ |x| File.file? x }

bn = managed_media_folder.map { |fn| File.basename fn } - destination.map { |fn| File.basename fn }
original_capture_scratch.each do |fn| 
  if bn.include? File.basename(fn)
    puts fn
    FileUtils.cp(fn, library_path_3) 
  end
end