喔賣尬!原來這就是vi 的 h j k l (左下上右鍵) 的由來^______^"

Here is why vim uses the hjkl keys as arrow keys

I was reading about vim the other day and found out why it used hjkl keys as arrow keys. When Bill Joycreated the vi text editor he used the ADM-3A terminal, which had the arrows on hjkl keys. Naturally he reused the same keys and the rest is history!

Here is how the hjkl keys looked:

ADM-3A keyboard's hjkl keys with arrows.

And here is the whole terminal that vi was created on:

Lear Siegler's ADM-3A computer terminal.

Since vim is derived from vi, it uses the same hjkl keys.

And while we're at it, notice where the ESC key is positioned:

Lear Siegler's ADM-3A computer terminal's full keyboard.

That's why the ESC is used to change between vi modes! Because it's so close and easy to reach.

Also ever wondered why home directory is ~ in UNIX? Look at the HOME key in upper right corner!

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資料來源：http://www.catonmat.net/blog/why-vim-uses-hjkl-as-arrow-keys/