Vi : modes,open,quit ,help

The text editor vi is either in insert mode or normal mode .

Insert mode – allows the user to type text into the document

Normal mode – keystrokes are commands controlling an edit session

 To enter Vi type:

 vi FILENAME

The filename can be an existing file or a file you want to create 

Vi has two modes: Normal (command) mode and edit mode.

 Switch to normal mode:     <ESC>

 Switch to edit mode:       i or a

Getting out of Vi (change to normal mode <ESC>):

 Exit Vi:                       :q

 Exit Vi (ignore changes):      :q!

 Save:                          :w

 Save and Exit:                 :wq

Switch to (edit) an other file:

:edit FILENAME

Getting help:

:help topic

 Some Vi  version specific information type:

 Vi