EFI Shell commands -- CLS(清除標準輸出與隨意改變背景顏色)

Clears the standard output and optionally changes the background color.

CLS [color]


    color    - New background color
                 0   - Black
                 1   - Blue
                 2   - Green
                 3   - Cyan
                 4   - Red
                 5   - Magenta
                 6   - Yellow
                 7   - Light gray

Note:
    1. If no parameters are specified, this command clears the standard output
       device. The background color is not changed.

Examples:
  * To clear standard output without changing the background color:
    fs0:\> cls

  * To clear standard output and change the background color to cyan:
    fs0:\> cls 3

  * To clear standard output and change the background to the default color:
    fs0:\> cls 0