Basics 3

- cursor location
  `<C-g>` to show location in file and file status. It means 'Ctrl+G'.
  `gg` is used to to start of file like using Ctrl+Home in gui editors
  `G` for end of file
  To go to specific line number `<line_number>G`. Eg: for line number 123 type `123G`.
- Search command
  To search word type `/<word>`. To search error type `/error`.  Then type `n` to go to next search and `N` to go to opposite one.
  `/` is used to search in direction from up to down. To search in direction from down to up use `?`.
  Note: To remove highlighting of previous search type `:let @/ = ""` or use `:noh`
  Reference:  https://stackoverflow.com/questions/657447/vim-clear-last-search-highlighting
To go back to where you came from press `<C-o>`.
    (keep `<Ctrl>` pressed down while pressing the letter `o`).
    Repeat to go back further. `<C-i>`{normal} goes forward.
- Matching parenthesis search
  Type `%` to find a matching `)`,`]`, or `}`.
  Place the cursor on parenthesis For eg on `(`
  tree (they r here [done] )
  Then type `%`. it will move to `)` . Now type `%` again and it will move back to `(`.
  
- Substitute command
  Type `:s/old/new/g` to substitute "new" for "old".
  Move the cursor to line where subtitution needed to be take place. If g is not used then only first occurence will be substituted instead of all occurences of current line.
  `:201,204s/old/new/g` : replace old with new from line 201 to 204
  For whole file
  `%s/old/new/g`
  For whole file but with prompt
  `%s/old/new/gc`
  
- Executing external commands
  `:!ls` or `:!pwd`
- Selecting text to write
  To start selecting text press `v` then move cursor right and down to area u want ti selected. To finish selecting a text type colon `:` `'<,'>` will appear now just type `w` and file name where u want to be saved
 `'<,'>w Test.txt`. Now selected text will be saved in filename 'Test.txt'
 
- Retrieving and merging file
  Move cursor to desired line and type
  `:r TEST` :This will copy contents of file TEST to current position
  `:r !ls` : This will copy  output of commands ls to current position