Modes of Operation
"vi" has two modes of operation, insert mode
and command mode. When you first enter
"vi" you will automatically be placed in command mode. All of the "vi"
editing commands are entered while in this mode. You can make certain
you are in command mode by pressing the [ESC] key on your terminal. If
you are already in command mode, no harm will be done by entering this
mode again. You can exit command mode and enter insert mode by
entering one of the insert commands.
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