1. Chapter 2
Basic vi Editor

2. Editor Concepts
Editing includes both creating a new file and modifying an existing file.
An editor is a utility that facilitates the editing task.
A text editor differs from a word processor in that it does not perform formatting such that bolding, centering, underlining.

3. The vi Editor
When you invoke the vi editor, it copies the content of a file to a memory space known as a buffer.
The editor presents a screen full of the buffer to the user for editing.
The vi has two modes: the command mode and the text mode.

4. Command Mode
When the vi editor is in the command mode, any key that is pressed by a user is considered to be a command.
Commands used to move the cursor, to delete or change part of the test, etc.
As soon is the command is entered , it is executed – the Return key is not required.

5. Changing Modes To invoke vi, you type vi filename
The filename is the name of the file that already exists or the name of the file you want to create.
When you invoke vi, you are always in the command mode.
To exit vi you must be in command mode.
There are six commands that take you to the text mode (a, A, i, I, o, and O).
When you are in the text mode, you press the Escape key (esc) to go to the command mode.

6. Text Mode
When the vi editor is in the text mode, any key that is pressed by a user is considered text.
The characters are inserted into the text at the cursor.
To add the test in a document, we should place the cursor at the desired location, which can be done in command mode.
Then we switch to the text mode and edit the text.

7. vi Modes

8. A Small File in vi

9. Insert Text Before the Cursor and Line
i inserts text before the current character
I inserts text at the beginning of the current line

10. Insert Text After the Cursor and Line
a appends text after the current character.
A appends text at the end of the current line.

11. Insert New Line
o opens an empty text line for new text after the current line
O opens an empty text line for new text before the current line

12. Horizontal Moves

13. Horizontal Moves

14. Vertical Moves

15. Vertical Moves

16. Delete Commands

17. The join Command

18. Scrolling ctrl+b scrolls up the whole screen
ctrl+f scrolls down the whole screen

19. Scrolling (cont) ctrl+u scrolls up half a screen
ctrl+d scrolls down half a screen
ctrl+y scrolls up one line
ctrl+e scrolls down one line

20. Undo Commands

21. Saving and Exit Commands:w
saves the contents of the buffer without quitting vi
writes contents of the buffer to new files and continues
saves the content of the buffer and exits
Exits the vi (if buffer changed will not exit)
Exits the vi without saving
:w filename ZZ
:wq :q
:q!