w    move cursor Right one word
b    Left one word
R    Overwrite text, press  to end
:set nu Display line numbers
:set nonu Hide line numbers
:set wm=10 Set Wrap Margin 10 spaces from right edge of screen
:set wm=0 Turn off Wrap Margin
ZZ   Write (if there were changes), then quit
e    Move to end of current word
:n   Go to line with this number (:10 goes to line 10)
H    Move to the top line of the screen
G    Go to last line of the file
M    Move to the middle line of the screen
L    Move to the last line of the screen
%    Move to matching bracket: ( { [ ] } )
c2w  is the same sa 2cw, change two words
c$ (or C) Beginning with the character under the cursor to end of line, change 
c^   Beginning with the character under the cursor to start of line, change 
6dw  deletes six words
6dd  deletes six lines
d$ (or D) Delete all characters to the end of the line.
:5,30d Delete lines 5 through 30
yy   Copy (yank) the current line 
6yy  Copy (yank) six lines, beginning with the current line
yw   Copy the current word
p (or put) Put the text after the cursor position
P    Put the text before the cursor position
:5,10y Copy lines 5-10 
.    Repeat last command
n.   Repeat last command n number of times
J    Join next line to current line
u    Undo last single change
U    Restore current line 
~    Change letter's case (capital to lower and vice versa)
"ayy Copy (yank) a line into buffer a
"Ayy Appends to buffer a
"a10yy Copies 10 lines into buffer a
"a10dd Deletes 10 lines of text into buffer a 
"ap  Put contents of lettered buffer a below the current line
Ctrl+ shows the line number of the current line 
:5,10 co 105 Copy lines 5-10 to the line after 105
:5,20 m $ Move lines 5-20 to end of file
:7,300 d Delete lines 7-300 (to buffer)
/text Search forward (down) for text (text can include spaces and characters with special meanings.)
?text Search backward (up) for text
n Repeat last search in the same direction
N Repeat last search in the opposite direction
fchar Search forward for a charcter on current line
Fchar Search backward for a character on current line
;   Repeat last character search in the same direction
%   Find matching ( ), { }, or [ ] 
:n1,n2s/old/new/gc n1 is the beginning line, n2 is the ending line number
s means to substitute text matching the pattern (old) with text specified by (new)
g (global) is optional. It indicates you want to substitute 
all occurrences on the indicated lines. If you use 
g, the editor substitutes only the first occurrence
on the indicated lines.
c (confirm) is optional. It indicates you want to confirm
each substitution before vi completes it. type y for yes, n for no or just enter
From Command Mode
:%s/old/new/g Substitutes old with new throughout the file
:.,$s/old/new/g Substitutes old with new from the current
cursor position to the end of the file
:^,.s/old/new/g Substitutes old with new from the beginning
of the file to the current cursor position
:&   Repeats the last substitute (:s) command
:w   file Write current file to file
:w>>file Append current file to file
:5,10w file Write lines 5 through 10 to file
:5,10w>>file Append Lines 5 through 10 to file
:r   file Read a copy of file into current file
:!ls See a list of files in your current directory
:n   file Read a file onto current Vi session
:set all Display all options
:set Display current settings of options
:set nooption Unset [option]
:set ai Set Auto Indentation during text entry
:set ic Set Ignore Case during searches
:set nu Show line Numbers 
:set sm Show Matching ( or { when ) or } is entered
:set wm=10 Set Wrap Margin 10 spaces from right edge of screen
:map @ :!dir ctrl+v  , when @ is hit (when vi in command mode)it is the same as :!dir is entered, which results in invoking dir command from vi
:map @ :!dir ctrl+v   same as above.
:ab UW UniversityofWashington in insert mode,whenever UW is typed in,Universityof Washington will appear.
vi file1 file2 vi two (or more) files at the same time
From Command Mode
:n   Move to file2 from file1
:rew Rewind back to file1
:e!  Restore original file1 file2 (start all over)
ZZ   Save and quit file. (Must be done for each file.)
:1,$> Move entire file 1 shift width (eight spaces) to the right
:1,$< Move entire file eight spaces to the left
:%s/^/ /g Insert any number of spaces at the beginning of each line in the entire file.
Simply press the space bar the desired number of times. 
:20>> Moves next 20 lines over 1 shift width.
:sh  Return to the shell to enter a number of shell,DOS commands without leaving vi. 
ctrl+z Minimize the window
d   Scroll down one-half screen  
u   Scroll up one-half screen  
f   Scroll forward one full screen  
b   Scroll backward one full screen
%      in ex-mode (pure ex mode), % is current file name
#      previously edited file name
:!cmd   in ex-mode, to run shell command [cmd]
:!cc %  compile the current file with cc
write a config file like config.v to customize your vi. suppose config.v contains:
    set noerrorbells
after open vi, at command mode, issue
    :so config.v
.    in command mode, is the current line 
:!! to repeat last shell command issured within vi
:map @ :w^[:!perl.pl a.pl^M
     map @, means hitting @ will save file(a.pl), then run this perl script (a.pl), ^[type in as ctrl+v, then type in Esc key. ^M: type in as ctrl+v, then type in enter key
:edit another_file   to edit another file another_file without exiting current vi session. This is very convient to copy something from another_file to current file being edited by vi
shift Q to go to pure ex-mode, causing vi not to see current mapping and abbreviations (that is unmap all and unabbr all). Then under pure ex-mode (this mode has :), issue vi to go back to vi session.
y/;   find ; on current line, then copy upto (not including);
y)    copy to the end of the line
ma    in command mode, mark current cursor position as a
`a    go to the position previously marked as a
'a    to to the line prevously marked with a
:map @  G:1^M'a  go to the end and then start of the file then go to the line marked with a, useful if you want to a specific location with a full screen of source code after issue cc command
y'a to copy down/up to the line marked with a from current line
"ay'a    to copy down/up to the line marked with a from current line into named buffer a
unm @    to unmap @
unabbr @ to unabbreviate @
@a     to execute the command stored with the named buffer a, suppose name buffer a contains following (which could be in your file):
        :1, 10s/^/    /
then @a will add four character space to the beginning of each of lines 1, 10
if named buffer a contains 
        H!Lsort
then @a will sort everything from the start to the end of the screen
:map z iif ()
{
}
else
{
}^[kkkllll   to insert:
        if ()
        {
        }
        else
        {
        }
and move cursor to the right paranthesis, when you hit z in command mode
>>   shell command for append a file to another file, like cat file1>>resultFile
echo>>file_name    shell command to write input [from screen] to file_name
:args    show argument list including names of files being edited by vi
:        repeat (or continue) last ex-mode command (which begins with :)
``       to go back to original position
[[ to go to beginning to section
]] to go to end of section

    
    


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