VI File Editing
There are three modes,
Command mode is used to enter vi commands, such as editing, saving, and exiting.
Edit mode is used to modify the contents of the file.
Last line mode is an extension of the command mode.
Mode 1 Command Mode
a or i enter edit mode
ZZ Exit
x Delete
Mode 2 Edit Mode
>
: Go to last line mode
esc go to command mode
mode 3 last line mode
:x save
:q exit
:w Save as
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