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Answer
False
In general, I don't like recommending ZZ to new users For one thing, it's all too easy to hit CTRL-Z instead while reaching for Shift, and new users will think they have written their file rather than just put the vi process in background.
There's a more serious problem with ZZ if you happen to use
:w copyofthis
Follow that with ZZ and you don't write what you think you did: you write "copyofthis" instead. Example
vi /tmp/t a whatever (escape) :w /tmp/copy ZZ
will leave /tmp/t empty.
Some older versions of vi had an even nastier problem with ZZ: if the file were write only, ZZ would just exit with no warning that you hadn't written. I'm pretty sure you won't see that except on something very old, but it could be out there.
Anyway, ":wq" is much safer than ZZ
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