Am 10. Sep, 2021 schwätzte Michael via PLUG-discuss so:

moin moin MIchael,

> how does  one save and exit with vi?

Carefully. :)

vi is a modal editor with editing mode and command mode.

To exit cleanly, you need to be in command mode.

Hit <esc> to make sure you're in command mode, then you can give an exit
command, which starts with a colon.

:q == simple quit if there have not been changes to the file
:wq == write the current changes, then quit
:q! == quit and throw away any changes

There are other variants you might see in documentation. They're
essentially aliases for one of the above.

ciao,

der.hans
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