All Unix Like systems will have a built-in vi document editor, but other document editors may not exist. But currently we use the vim editor more. Vim is a text editor developed from vi.
The "q!" command in vi forces an exit without saving.
Some common commands in vi:
:w save;
:w filename save as filename;
:wq ! Save and force exit;
:wq! filename Note: Force exit after saving with filename as the file name;
:x Save and exit (only save when the file has changed)
Recommended learning: linux tutorial
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