printBasicHelp() {
    // ember command-name
    let output;
    if (this.isRoot) {
      output = `Usage: ${this.name}`;
    } else {
      output = `ember ${this.name}`;
    }

    output += this._printCommand();
    output += EOL;

    return output;
  }
Prints basic help for the command.

    Basic help looks like this:

        ember generate <blueprint> <options...>
          Generates new code from blueprints
          aliases: g
          --dry-run (Default: false)
          --verbose (Default: false)

    The default implementation is designed to cover all bases
    but may be overridden if necessary.

    @method printBasicHelp