VI means virtual editor.
VI is installed in every Unix system
VI editor has to mode:
Command mode:
By default mode is command mode.
This made enables you to perform admistrative task such as save, cut, copy, pasting, find, replace
To return into command mode use Esc button.
save command:--> :w, :w<another filename>
save+quit--> :wq, ZZ
quit without save:--> :q!
move within file: k-->up, j-->down, h-->left, l--> right,w-->next word,b -->previous word, u-->undo
delete command :
x-->delete characters under the current location.
X-->delete characters before the cursor location.
dw-->delete word
d^ -->delete from current cursor to begging of line
d$, D -->delete from current cursor to end of line
dd --> delete line
<n>dd--> delete n line from current cursor.
change command:
cc--> Removing the contents of the line and leaving in insert mode.
cw-->change word
r-->replace the character.
R-->Overwrites multiple characters begging with current cursor. you must use Esc to stop the overriding.
s-->Replace the current character with the character you type.
S-->Delete the line the current cursor.
Copy and paste command:
yy --> Copies the current line.
yw --> copies the current word.
p -->Puts the copied text after the cursor.
P -->puts the copied test before the cursor.
Set Command:
:set ic -->ignore the case while searching
:set ai -->set autoindent
:set noai -->unset autoindent
:set nu -->set line number
:set nonu -->unset linenumber
Running Command
:! -->vi has capability to run commands within the editor.
:! ls -->output of ls command
Replacing command:
:s/search/replace/g -->substitution command (:s/) enable you to quickly replace word or group of words within your file.
g stands for globally.
2. Insert mode:
To edit the file we need to be in insert mode. way to enter in insert mode.
i-->insert text before the current cursor.
I-->Insert test at the begging of the current line
a-->Insert text after the current cursor.
A-->insert text at the end of the current line.
o-->Create a new line for text entry below.
O-->Create a new line for text entry above.
Advanced Command:
word and character search: Vi editor has two search string and character.
/ -->search downward in file.
? -->search upward in file.
n & N -->repeat the previous search command.
^ -->Searches at the beginning of the line.
. -->Matches a single character.
* -->Matches zero or more of the previous character.
$ -->End of the line
[ -->start a set of matching or non-matching expression.
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