"git show --usage" no "usage" displayed

[Nicholas Hsiang <xianghongai@xxxxxxxxx>]

Dear git:

When I type `git remote --usage`, The command panel will prompt
'error: unknown option `usage', Then there will be `git remote`
related instructions.
But I type `git show --usage`, just display 'fatal: unrecognized
argument: --usage'.

![git-show-command-no-display-usage.png](https://i.loli.net/2018/12/21/5c1c4d34075c4.png)

Sorry, the previou email forgot to write the title. The previou
previou email did not remove the HTML format.

Yours sincerely,
Xiang HongAi.
--
Live Long and Prosper.