ruby 空目录（删除所有文件）
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Empty directory (delete all files)
提问by Pablo
What would be a safe and efficient way to delete all files in a directory in pure Ruby? I wrote
在纯 Ruby 中删除目录中所有文件的安全有效方法是什么？我写
Dir.foreach(dir_path) {|f| File.delete(f) if f != '.' && f != '..'}
but it gives me a No such file or directoryerror.
但它给了我一个No such file or directory错误。
Thank you.
谢谢你。
采纳答案by sarnold
You're probably getting that error because your current working directory doesn't match dir_path-- File.delete(f)is being given just the filename for a file in dir_path. (I hope you didn't have any important files in the current working directory with same names in the dir_pathdirectory.)
您可能会收到该错误，因为您当前的工作目录不匹配dir_path-File.delete(f)只给出了dir_path. （我希望您在当前工作目录中没有任何同名的重要文件dir_path。）
You need to use File.join(dir_path, f)to construct the filename you wish to delete. You also need to figure out how you want to handle directories:
您需要使用File.join(dir_path, f)来构造要删除的文件名。您还需要弄清楚如何处理目录：
Dir.foreach(dir_path) do |f|
fn = File.join(dir_path, f)
File.delete(fn) if f != '.' && f != '..'
end
Errno::EISDIR: Is a directory - /tmp/testing/blubber
from (irb):10:in `delete'
from (irb):10
from (irb):10:in `foreach'
from (irb):10
from :0
回答by Mario Uher
What about FileUtils.rm_rf("#{dir_path}/.", secure: true)?
怎么样FileUtils.rm_rf("#{dir_path}/.", secure: true)？
回答by MyroslavN
FileUtils.rm_rf Dir.glob("#{dir_path}/*") if dir_path.present?
回答by denis.peplin
Everybody suggest rm_rf, but the safer way is to use rm_f, which is an alias to rm force: true.
大家建议rm_rf，但更安全的方法是使用rm_f，它是 的别名rm force: true。
FileUtils.rm_f Dir.glob("#{dir_path}/*")
This method will not remove directories, it will only remove files: http://ruby-doc.org/stdlib-2.2.0/libdoc/fileutils/rdoc/FileUtils.html#method-c-rm
此方法不会删除目录，只会删除文件：http: //ruby-doc.org/stdlib-2.2.0/libdoc/fileutils/rdoc/FileUtils.html#method-c-rm
回答by tcurdt
The Tin Man almost got it right - but in case the directories are not empty use
铁皮人几乎做对了 - 但如果目录不是空的，请使用
Pathname.new(dir_path).children.each { |p| p.rmtree }
回答by LiamD
To tack on to MyroslavN, if you wanted to do it with Pathname (like with Rails.root, if it's a rails app) you want this:
继续使用 MyroslavN，如果你想用 Pathname（比如 Rails.root，如果它是一个 rails 应用程序）你想要这个：
FileUtils.rm_rf Dir.glob(Rails.root.join('foo', 'bar', '*'))
I'm posting this because I did a bad copypaste of his answer, and I accidentally wound up with an extra slash in my path:
我发布这个是因为我对他的回答做了错误的复制粘贴，而且我不小心在我的路径中添加了一个额外的斜线：
Rails.root.join('foo', 'bar', '/*')
Which evaluates to /*because it sees it as a root path. And if you put that in the FileUtils.rm_rf Dir.globit will attempt to recursively delete everything it can (probably limited by your permissions) in your filesystem.
其评估为，/*因为它将其视为根路径。如果你把FileUtils.rm_rf Dir.glob它放进去，它会尝试递归地删除你文件系统中的所有东西（可能受你的权限限制）。
回答by the Tin Man
Now days, I like using the Pathnameclass when working on files or directories.
现在，我喜欢在处理文件或目录时使用Pathname类。
This should get you started:
这应该让你开始：
Pathname.new(dir_path).children.each { |p| p.unlink }
unlinkwill remove directories or files, so if you have nested directories you want to preserve you'll have to test for them:
unlink将删除目录或文件，因此如果您有要保留的嵌套目录，则必须对其进行测试：
Removes a file or directory, using File.unlink if self is a file, or Dir.unlink as necessary.
删除文件或目录，如果 self 是文件，则使用 File.unlink ，或根据需要使用 Dir.unlink 。
回答by Ali Akbar
Dir.foreach(dir_path) {|f| File.delete("#{dir_path}/#{f}") if f != '.' && f != '..'}
