code: public int runAll() {
      int exitCode = 0;
      if (args == null) { // no argument
        return run();
      }
      
      for (String src : args) {
        try {
          Path srcPath = new Path(src);
          FileSystem fs = srcPath.getFileSystem(getConf());
          FileStatus[] statuses = fs.globStatus(srcPath);
          if (statuses == null) {
            System.err.println("Can not find listing for " + src);
            exitCode = -1;
          } else {
            for(FileStatus s : statuses) {
              try {
                run(s.getPath());
              } catch (FileNotFoundException ex) {
                // We are testing if the srcPath was given as a specific path
                // or as a mask. If it was a mask we skip the exception.
                // otherwise we have to propagate it
                if (s.getPath().equals(srcPath.makeQualified(fs))) {
                  throw ex;
                }
              }
            }
          }
        } catch (IOException e) {
          exitCode = -1;
          handleIOException(e);
        }
      }
      return exitCode;
    }
docs: For each source path, execute the command
  
  @return 0 if it runs successfully; -1 if it fails