Unix in a Nutshell, 4th Edition

Saving and Exiting

Writing a file means overwriting the file with the current text.

ZZ	Quit vi , writing the file only if changes were made.
:x	Same as ZZ.
:wq	Write file and quit.
:w	Write file.
:w file	Save copy to file.
: n , m w file	Write lines n to m to new file.
: n , m w >> file	Append lines n to m to existing file.
:w!	Write file (overriding protection).
:w! file	Overwrite file with current text.
:w %. new	Write current buffer named file as file .new.
:q	Quit vi (fails if changes were made).
:q!	Quit vi (discarding edits).
Q	Quit vi and invoke ex.
:vi	Return to vi after Q command.
%	Replaced with current filename in editing commands.
#	Replaced with alternate filename in editing commands.