AMINUL ISLAM SHAMIM

1. i - Insert at cursor (goes into insert mode)
3. a - Write after cursor (goes into insert mode)
5. A - Write at the end of line (goes into insert mode)
7. ESC - Terminate insert mode
9. u - Undo last change
11. U - Undo all changes to the entire line
13. o - Open a new line (goes into insert mode)
15. dd - Delete line
17. 3dd - Delete 3 lines.
19. D - Delete contents of line after the cursor
21. C - Delete contents of a line after the cursor and insert new text. Press ESC key to end insertion.
23. dw - Delete word
25. 4dw - Delete 4 words
27. cw - Change word
29. x - Delete character at the cursor
31. r - Replace character
33. R - Overwrite characters from cursor onward
35. s - Substitute one character under cursor continue to insert
37. S - Substitute entire line and begin to insert at the beginning of the line
39. ~ - Change case of individual character

Note: You should be in the “command mode” to execute these commands. VI editor is case-sensitive so make sure you type the commands in the right letter-case.

Make sure you press the right command otherwise you will end up making undesirable changes to the file. You can also enter the insert mode by pressing a, A, o, as required.

Moving within a file

1. k - Move cursor up
3. j - Move cursor down
5. h - Move cursor left
7. l - Move cursor right

You need to be in the command mode to move within a file. The default keys for navigation are mentioned below else; You can also use the arrow keys on the keyboard.

Saving and Closing the file

1. Shift+zz - Save the file and quit
3. :w - Save the file but keep it open
5. :q - Quit without saving
7. :wq - Save the file and quit