手册页中带有下划线的单词的含义是什么？

对于我所见过的大多数命令，它们的man页面中都有带下划线的单词。下划线是什么意思？那是链接吗？如果是，我们如何去那儿？

手册页中大多数带下划线的单词都是要强调的。它不是超链接。

也来自man手册页

   italic text        replace with appropriate argument.
   [-abc]             any or all arguments within [ ] are optional.
   -a|-b              options delimited by | cannot be used together.

   argument ...       argument is repeatable.
   [expression] ...   entire expression within [ ] is repeatable.

   Exact rendering may vary depending on the output device.  For instance,
   man will usually not be able to render italics when running in a termi‐
   nal, and will typically use underlined or coloured text instead.