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Creating files touch, cat, vi, vim

  



* Creating File's 


1. touch  

     - To create a empty file ( 0 KB )

     - Drawback :  We can not write,modify,read file content

       # touch    test 
   
       # touch  a  b  c  

2.  cat  ( Concatenate )

      - To create file, write file , read file content.

      - Drawback  : We can not modify the file content 

       #  cat   >  test  

            WELCOME 

        Press Ctrl + d  ( To save and Quit file )

     #  cat   test    ( To read file  content )

      #  cat   >>  test  

            WELCOME 
             REDHAT 
         
        Press Ctrl + d  ( To save and Quit file ) 


3. vi  ( Visual Interface  ) 

      -  VI is a text editor tool it is used for to create file, write file , read file content,to 

           modify file content.

      - Drawback  : no colour highlighting feature 

        #  vi    test  

             Press "i"  OR "   "Insert"    Key

               WELCOME  

            Press Esc  , Press Shift+ :  ,  wq!  ( To save and Quit file )

            Press Esc  , Press Shift+ :  ,  q!   (    To  Quit file )   
     

4. VIM (  VI  Improved )

     - VI is a text editor tool it is used for to create file, write file , read file content,to 

        modify file content. Also called modal editor because without using mouse.
               
               

         #  vim    linux  

             Press "i"  OR "   "Insert"    Key

               WELCOME  

            Press Esc  , Press Shift+ :  ,  wq!  ( To save and Quit file )

            Press Esc  , Press Shift+ :  ,  q!   (    To  Quit file )


  * Mode's  Of  VI and VIM 
---------------------------------------------------------------------------------------------

1.     Insert Mode  : Normal text editing. To write and Modify file content.
ESC + i
                Entering Insert mode
i      At the cursor.
a     After the cursor.
I      Before the current line.
A     After the current line.
o      Insert a new line after the current line.
O      Insert a new line before the current line.
C       Ovewrite the whold current line.
ESC   Exit Insert mode.

   2. Ex ( Extended Mode )   : To save and Quit file. Open, search, replace
                :wq! (save and quit)
                :q! (quit without saving)
                :w (save only)
:set nu Display line numbers.
                Esc   :set nu                                       To set Line numbers 
                Esc  :Line Number                              To go to the specific line   
                :%s/searchtext/replacetex/g    

                :q!
                :q!

                :q!
                :q!

                :q!

   3. Command Mode  : It is used to perform linux yanking or file navigation operation ( cut , copy , paste, undo, redo)


            Shortcut Key                                   Purpose  

           Esc  yy                                               To copy Entire Line 

           Esc  p                                                 To  Paste Or Put 

           Esc  cc                                                To cut Entire Line 

           Esc  dd                                                To delete Entire Line 
       
           Esc  yw                                                To copy word  

           Esc  cw                                              To cut word

           Esc  dw                                              To delete word

           Esc  nyy                                             To Copy n number of lines

           
           Esc Shift + g                                      To go to the last line
  

Movement

h            Move left one character.
j             Move down one character.
k            Move up one character.
l             Move right one character.
w           Move forward one word.
b            Move to the start of the word.
e             Move to the end of the word.
(             Move back one sentence.
)             Move forward one sentence.
{             Move back one paragraph.
}            Move forward one paragraph.
^           Move to the beginning of the line.
$            Move to the end of the line.
<n>G    Move to the nth line.
G            Move to the last line.
gg            Move to the first line.
%             Move to the matching bracket.


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