Which of the following key-combinations are used to view a file in two windows in...

A file can be viewed in two windows in a single vim screen by issuing Ctrl-w, s and Ctrl-w, v. The Keycombination

Ctrl-w, s splits the vim screen horizontally. The key-combination Ctrl-w, v splits the screen vertically.

Answer option C is incorrect. The Key-combination :wq is used to save a file and quit from the file in a vim text-editor.

Answer option D is incorrect. The key combination :q! is used to quit from a file without saving its contents.

What is vim?

Vim is an advanced text editor that seeks to provide the power of the Unix editor vi with a more complete feature set. Vim is useful whether a user is already using vi or using a different editor. Vim is a highly configurable text editor built to enable efficient text editing. It is an improved version of the vi editor distributed with most Unix systems. It is perfect for all kinds of text editing, from composing email to editing configuration files.