Useful Vi editor commands

VI Navigation  [escape key = ]
0  [zero] = Move to beginning of line
G         = Go to end of file
5G        = Move to beginning of 5th line
u         = Undo
.         = Repeat last command
x         = Delete character
dd        = Delete line
dw        = Delete word
d$        = Delete from cursor to end of line
$ then J  = Join/append following line with current
$ then a  = Append input at end of line
A         = Append input at end of line [same as above, but one less key stroke]
i         = Insert text at cursor
/         = Bottom of screen type search string and  will move 
                 cursor to first occurrence

Replace text

.  :1,$s /and/AND/g
   ^^^^^   ^   ^  ^
   |||||   |   |  |
   |||||   |   |  \----------- Globally
   |||||   |   \-------------- Replace with
   |||||   \------------------ Find
   |||||
   ||||\---------------------- substitute for text
   |||\----------------------- To last line
   ||\------------------------ separator
   |\------------------------- From line "1"
   \-------------------------- ":" operator to start command processing
Useful tid bit to remove EOL characters from DOS file 
[use key sequence "" together for EOL char]
 :%s/^M$//

Write lines to new file

:1,10w abc     [puts lines 1~10 into file abc]

Change working file from current to file abc [be sure to save first]

:e abc

Read abc file into working file after cursor

:r abc

Execute command from prompt

:!cmd    [where cmd is could be a bash command]

Example ->    :r !date   [inserts time and date at prompt]

From online wiki resource: http://en.wikibooks.org/wiki/Linux_Guide/Using_the_shell