code: public int run(String[] args) throws Exception {
  		int exitCode = 0;
  		exitCode = init(args);
  		if (exitCode != 0) {
  			return exitCode;
  		}
  		// genDirStructure();
  		genFiles();
  		return exitCode;
  	}
docs: Main function. It first parses the command line arguments. It then reads
  the directory structure from the input directory structure file and
  creates directory structure in the file system namespace. Afterwards it
  reads the file attributes and creates files in the file. All file content
  is filled with 'a'.
  
  @return