# File lib/travis/tools/completion.rb, line 21
      def install_completion
        update_completion
        source = "source " << cmp_file

        RCS.each do |file|
          next unless File.exist? file and File.writable? file
          next if File.read(file).include? source
          File.open(file, "a") { |f| f.puts("", "# added by travis gem", "[ -f #{cmp_file} ] && #{source}") }
        end
      end