code: @Override
  	public void run(Line line) {
  		List<String> args = line.args();
  		
  		if (args.isEmpty()) {
  			shell.console().println(usage().toString());
  			return;
  		}
  		
  		String command = line.args().get(0);
  		Command c = shell.commands().get(command);
  		
  		if (c == null) {
  			shell.console().println("no help topic for '" + command + "'");
  			return;
  		}
  		
  		shell.console().println(c.usage().toString());
  	}
docs: /* (non-Javadoc)
  @see org.eiichiro.ash.Command#run(org.eiichiro.ash.Line)