Emacs: Minibuffer
What is Minibuffer
Minibuffer is the area at the bottom where emacs prompt you for some answers. e.g. file name, command name, etc.

Minibuffer Keys
The following are standard keys while in minibuffer.
- 【C-j】
minibuffer-complete-and-exit
- 【RET】
exit-minibuffer
- 【C-g】
abort-recursive-edit
- 【<up>】
previous-history-element
- 【<down>】
next-history-element
- 【M-p】
previous-history-element
- 【M-n】
next-history-element
- 【M-s】
next-matching-history-element
- 【M-r】
previous-matching-history-element
minibuffer with icomplete-vertical-mode
minibuffer can be configured to display choices vertically.

icomplete-vertical-mode
[see Emacs: icomplete, Name Completion]