H大括号

我在lodash.com看到这个安装片段：

$ {sudo -H} npm i -g npm

为什么有大括号？

区别在哪里：

$ sudo -H npm i -g npm

谢谢！

---

更新：看看你的问题的意见。 它不是bash相关的。

bash手册页的摘录。 希望这可以帮助。

{list; }

         list is simply executed in the current shell environment.   list
         must  be  terminated with a newline or semicolon.  This is known
         as a group command.  The return status is  the  exit  status  of
         list.   Note that unlike the metacharacters ( and ), { and } are
         reserved words and must occur where a reserved word is permitted
         to  be  recognized.   Since they do not cause a word break, they
         must be separated from  list  by  whitespace  or  another  shell
         metacharacter.

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