Open a file in vi editor and modify the content of the file.
Now try entering :q
of modern UNIX is the energy of the UNIX programming community; plenty of UNIX users
decide to write a new version of a command in order to solve slightly different problems, thus
spawning many versions of a command.
C
No write since last change (:quit! overrides)
You get the error as above. In this case you should enter :q!
Hence
:q means quit vi editor
:q! quit regardless of whether any changes have occured
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