Section 7.1. Review of vi Operations

7.1. Review of vi Operations

This section provides a review of the following:

• Command-line options

• vi modes

• Syntax of vi commands

• Status-line commands

7.1.1. Command Mode

Once the file is opened, you are in command mode . From command mode, you can:

• Invoke insert mode .

• Issue editing commands.

• Move the cursor to a different position in the file.

• Invoke ex commands.

• Invoke a Linux shell.

• Save or exit the current version of the file.

7.1.2. Insert Mode

In insert mode , you can enter new text in the file. Press the Esc or Ctrl-[ keys to exit insert mode and return to command mode. The following commands invoke insert mode:

a

Append after cursor.

A

Append at end of line.

c

Begin change operation (must be followed by a movement command).

C

Change to end of line.

i

Insert before cursor.

I

Insert at beginning of line.

o

Open a line below current line.

O

Open a line above current line.

r

Replace character under cursor.

R

Begin overwriting text.

s

Substitute a character.

S

Substitute entire line.

7.1.3. Syntax of vi Commands

In vi , commands have the following general form:

 [   n   ]   operator   [   m   ]   object   

Here are the basic editing operators :

c

Begin a change.

d

Begin a deletion.

y

Begin a yank (or copy).

If the current line is the object of the operation, the operator is the same as the object: cc , dd , yy . Otherwise, the editing operators act on objects specified by cursor-movement commands or pattern-matching commands. n and m are the number of times the operation is performed or the number of objects the operation is performed on. If both n and m are specified, the effect is n m .

An object can represent any of the following text blocks:

Word

Includes characters up to a space or punctuation mark. A capitalized object is a variant form that recognizes only blank spaces.

Sentence

Extends to . , ! , or ? followed by two spaces.

Paragraph

Extends to next blank line or nroff / troff paragraph macro (defined by para = option ).

Section

Extends to next nroff / troff section heading (defined by sect = option ).

7.1.3.1. Examples

2cw

Change the next two words

d}

Delete up to next paragraph

d^

Delete back to beginning of line

5yy

Copy the next five lines into temporary buffer (for future pasting)

y]]

Copy up to the next section into temporary buffer (for future pasting)

7.1.4. Status-Line Commands

Most commands aren't echoed on the screen as you input them. However, the status line at the bottom of the screen is used to echo input for the following commands:

/

Search forward for a pattern

?

Search backward for a pattern

:

Invoke an ex command

!

Pipe the text indicated by a subsequent movement command through the following shell command, and replace the text with the output of the shell command

Commands that are input on the status line must be entered by pressing the Return key. In addition, error messages and output from the Ctrl-G command are displayed on the status line.