code: @Override
  	public void run(Line line) {
  		try {
  			shell.console().reader().printColumns(shell.commands().keySet());
  		} catch (IOException e) {
  			e.printStackTrace(new PrintWriter(shell.console().reader().getOutput()));
  		}
  	}
docs: /* (non-Javadoc)
  @see org.eiichiro.ash.Command#run(org.eiichiro.ash.Line)