Description: vi is the most useful standard text editor on your system. (vi is
short for visual editor and is pronounced "vee-eye.") Unlike emacs,
it is available in nearly identical form on almost every UNIX system,
thus providing a kind of text-editing lingua franca.[1] The same might
be said of ed and ex, but screen editors are generally much easier
to use. With a screen editor, you can scroll the page, move the
cursor, delete lines, insert characters, and more, while seeing the
results of your edits as you make them. Screen editors are very
popular, since they allow you to make changes as you read through
a file, like you would edit a printed copy, only faster.
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OREILIY-Learning_The_VI_Editor_Sixth_Edition.pdf