Get names of all files from a folder with Ruby

Question

I want to get all file names from a folder using Ruby.

Answer 1

This is what works for me:

Dir.entries(dir).select { |f| File.file?(File.join(dir, f)) }

Dir.entries returns an array of strings. Then, we have to provide a full path of the file to File.file?, unless dir is equal to our current working directory. That's why this File.join().

Answer 2

You may also want to use Rake::FileList (provided you have rake dependency):

FileList.new('lib/*') do |file|
  p file
end

According to the API:

FileLists are lazy. When given a list of glob patterns for possible files to be included in the file list, instead of searching the file structures to find the files, a FileList holds the pattern for latter use.

https://docs.ruby-lang.org/en/2.1.0/Rake/FileList.html

Answer 3

This is a solution to find files in a directory:

files = Dir["/work/myfolder/**/*.txt"]

files.each do |file_name|
  if !File.directory? file_name
    puts file_name
    File.open(file_name) do |file|
      file.each_line do |line|
        if line =~ /banco1/
          puts "Found: #{line}"
        end
      end
    end
  end
end

Answer 4

While getting all the file names in a directory, this snippet can be used to reject both directories [., ..] and hidden files which start with a .

files = Dir.entries("your/folder").reject {|f| File.directory?(f) || f[0].include?('.')}

Answer 5

this code returns only filenames with their extension (without a global path)

Dir.children("/path/to/search/")

Answer 6

The following snippets exactly shows the name of the files inside a directory, skipping subdirectories and ".", ".." dotted folders:

Dir.entries("your/folder").select { |f| File.file? File.join("your/folder", f) }