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.