code: def write (string, to, as: user, on: hosts, quiet: false, once: nil)
        self.once once, quiet: quiet do
          log.info "write: #{string.bytesize} bytes -> #{to}", quiet: quiet do
            hash_map(hosts) do |host|
              host.write string, to, as: as, quiet: quiet
            end
          end
        end
      end
docs: Writes a string to a file on the host filesystems.
   @param [String] string The string to write.
   @param [String] to The file name to write the string to.
   @macro onable
   @macro asable
   @macro quietable
   @macro onceable