#MODE: INSERT
root@oco:~$ vi fileName
vim:~$ i
#MODE: NORMAL MODE
root@oco:~$ vi fileName
vim:~$ i
vim:~$ ESC
#MODE: COMMAND MODE
root@oco:~$ vi fileName
vim:~$ i
vim:~$ :{character}
SAVING/EXITING
#MODE: COMMAND MODE
root@oco:~$ vi fileName
vim:~$ i
vim:~$ :{character}
* :w Write the file, save
:q Quit
:q! Quit without saving
:wq Write and quit