Change to argf - works command line, not

argf.rb

kernel/loader.rb : line 279

      options.on "-i", "[EXT]", "Edit ARGV files in place, making backup with EXT" do |ext|
        # in place edit mode
        $-i = ext || true
      end

kernel/common/argf.rb : line 476

    def advance!
      return true unless @advance

      unless @init

        if ARGV.empty?
          @advance = false
          @stream = STDIN
          if $-i
            $stdout.close
            $stdout = @original_stdout
            File.delete(@original_file) if @original_file
          end
          @filename = "-"
          @use_stdin_only = true
          return true
        end

        @init = true
      end

      return false if @use_stdin_only || ARGV.empty?

      @advance = false

      file = ARGV.shift
      if $-i
        if $-i == true # yes, I mean specifically true
          require 'tempfile'
          new_file_name = Tempfile.new(file).path
          @original_file = new_file_name
        else
          new_file_name = file + $-i
        end
          
        File.rename file, new_file_name
        $stdout, @original_stdout = File.open(file, "w"), $stdout
        file = new_file_name
      end

      @stream = (file == "-" ? STDIN : File.open(file, "r"))
      @filename = file

      return true
    end
    private :advance!

  end