How to exit VI with or without saving

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Although many alternatives exist, I like using vi for all my command line editing needs. To save changes, I usually use SHIFT + Z + Z, exiting vi under most circumstances.

But sometimes, this trick doesn’t work because of write permission problems. In such cases, vi doesn’t close with the above command. Instead, we must either stash our changes in another file, or quit the session without saving. Here’s how to do that.

Quit vi without saving:
:q!

Save current file under a different name:
:w newfile

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