Vim

Introduction

The screen-oriented text editor vim stems from vi, written in '76 for an early BSD Unix release by Bill Joy. vi is old, nonintuitive, and complex. vim stems from 1991, and stands for Vi IMproved, but its improvements do not lessen it's nonintuitivity or complexity.

So why do we feel that vim is an essential system tool? Well, it's because

• vi can be found on just about any Linux and Unix system
• vi is very powerful
• with some practice, it's even usable.

Installation and configuration

When you install vim, you also get xxd, a tool to make a hexdump, or convert a hex dump back to it's original binary form.

Using VIM

Vim operates in 2 modus. A command mode and a insert mode. You start in command mode so almost every key is a command. You can switch to insert mode with i to return in command mode press esc or ( ctrl [ ) Start in insert mode and typ some text. To save your progress return in command mode with esc Now we can use the ex-commands typ :w to save the document. or use these commands.

:w  Save
:w 'filename' Save with this filename
:q  quit vim
:q! quit without save
:wq save and quit

Cursor positioning

Key(s)	Movement
j	down one line, same column
k	up one line, same column
h	one character back
l,<space>	one character forward
b	one word back (to beginning of previous word)
e	one word back (to end of previous word)
w	one word forward
<enter>	beginning of next line
0 (zero)	beginning of line
$	end of line
nG	to beginning of line n; if no number given, the last line of the file
:n	also to beginning of line n (but this is visible as command)

Searching

Key(s)	Movement
/pattern	Moves the cursor to the next occurrence of pattern; will wrap around to the beginning of the file from the last occurence
?pattern	Moves the cursor backward to the previous occurrence of pattern; will wrap around to the end of the file from the first occurence
n	repeats last pattern search (either / or ?)

Text insertion

a   Appends text after cursor. Terminated by escape key. 
A   Appends text at the end of the line. Terminated the escape key. 
i   Inserts text before cursor. Terminated by the escape key. 
I   Inserts text at the beginning of the line. Terminated by the escape key. 
o   Opens new line below the current line for text insertion. Terminated by the escape key. 
O   Opens new line above the current line for text insertion. Terminated by the escape key. 
DEL Overwrites last character during text insertion. 
ESC Stops text insertion. The escape key on the DECstations is the F11 key

Notes

In Debian Etch, the default editor is nano instead of vim. This can be changed in the following way:

sudo update-alternatives --set editor /usr/bin/vim.tiny

Now all commands that invoke an editor will use vi instead of vim. Is that a good thing? We're not sure, but we do want to keep our vi skills up to par, so we do this.