code: public static final String getOwner(Path file) throws IOException
      {
          if (supports("posix"))
          {
              UserPrincipal owner = (UserPrincipal) Files.getAttribute(file, "posix:owner");
              return owner.getName();
          }
          else
          {
              JavaLogging.getLogger(PosixHelp.class).warning("no owner support. getOwner(%s) returns \"\"", file);
              return "";
          }
      }
docs: Return linux file owner name. Or ""
  @param file
  @return
  @throws IOException