[Ruby] File operations memo

Some memo when doing some file operations with ruby.

# Get files recursively
Dir.glob("**/*.txt") do |f|
  # Do something..
end

# Directory check
Dir.exist?(directory_name)

# File check
File.exist?(file_name)

# Get file name from path
File.basename(path)

# Get directory name from path
File.dirname(path)

# Create directory recursively
FileUtils.mkdir_p(dir_path)

# Copy
FileUtils.cp(source_file, destination_dir)

# Any command
`mv #{source} #{destination}`