vi quick reference

ESC , then ":": command mode
Move :
h left one character
l right one character
k up one line
j down one line

b back one word
f forward one word
{ up one paragraph
} down one paragraph
$ to end of the line

^B back one page
^F forward one page
17G to line #17
G to the last line

Insert :
i just before the current cursor position
a just after the current cursor position
o into a new line below current cursor
I at the beginning of the current line
A at the end of the current line
O into a new line above current cursor
search : /
replace : r, R
replace (global) : %s/old/new/g
change : c, C

>> Copy current line     yy  or Y
>> Copy a word           yw
>> Copy 4 words          y4w  or 4yw
>> Paste after cursor    p
>> Paste before cursor   P
>> Move current line after line 5   :m 5
>> Move line x after line 5         :xt 5
>> Move line 9 after line 5         :9t 5
>> Undo last modification                u
>> Undo all changes on a given line      U
>> Global search and replace  -->  :1,$ s/old/new/g
>> Insert file at cursor position -->  :r filename


Capitalize the first letter of each word from line #26  through the end of the file  --> :26,$s/\<[a-z]/\U&/g  Multi file editing  

vi can manipulate more than one file at the same time, therefore to edit three files in sequence, type:
vi one two three
To detect which file is currently edited use the ex ar (args) command:
:ar
that types file list and flags current file at screen bottom as follows:
one [two] three

:w	write file with the following message at screen bottom:
	"vi_ex.doc" 670 lines, 27747 chars
ZZ	terminate current editing with the following message at screen bottom:
	2 more files to edit

To move along files in the list:

vi Multifile Moving Commands
:n	edit next file in the list
: Nn	advance n files in the list
~	toggle between the two last files
:e#	reopen previous file, same as above
e file	re-edit from disk
:rew	rewind file pointer to first file
:rew!	force rewind and immediatly reopen first file
:ar	list file names