code: public void printUsage(Command command) {
          String commandName = command.getDescriptor().getName();
          StringBuilder sb = new StringBuilder(getSyntaxPrefix()).append(commandName).append(" ");
  
          // create a list for processed option groups
          Collection<OptionGroup> processedGroups = new ArrayList<>();
  
          Collection<Option> optList = command.getOptions().getAllOptions();
          if (optList.size() > 1 && getOptionComparator() != null) {
              List<Option> optList2 = new ArrayList<>(optList);
              optList2.sort(getOptionComparator());
              optList = optList2;
          }
  
          for (Iterator<Option> it = optList.iterator(); it.hasNext();) {
              // get the next Option
              Option option = it.next();
              // check if the option is part of an OptionGroup
              OptionGroup group = command.getOptions().getOptionGroup(option);
              if (group != null) {
                  // if the group has not already been processed
                  if (!processedGroups.contains(group)) {
                      // add the group to the processed list
                      processedGroups.add(group);
                      // add the usage clause
                      appendOptionGroup(sb, group);
                  }
                  // otherwise the option was displayed in the group
                  // previously so ignore it.
              }
              // if the Option is not part of an OptionGroup
              else {
                  appendOption(sb, option, option.isRequired());
              }
              if (it.hasNext()) {
                  sb.append(" ");
              }
          }
  
          for (Arguments arguments : command.getArgumentsList()) {
              sb.append(" ");
              appendArguments(sb, arguments);
          }
  
          printWrapped(getSyntaxPrefix().length() + commandName.length() + 1, sb.toString());
      }
docs: Prints the usage statement for the specified command.
  
  @param command the Command instance