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File a file starting with certain string

require 'find' module Find   def match(*paths)     matched = []     find(*paths) { |path| matched << path if yield path }     return matched   end   module_function :match end must_start_with = "This Ruby program" Find.match('./') do |p|   if File.file? p     open(p) { |f| f.read(must_start_with.size) == must_start_with }   else     false   end end # => ["./rubyprog-0.1/README"]