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Random and a little niche but here goes:

the mnemonic is "duey"

in vi

Ctrl-d scrolls down a page
Ctrl-u scrolls up a page
Ctrl-e scrolls down a line
Ctrl-y scrolls up a line

I use crtl-y and crtl-e all the time to
like get the view of the file where i want
on the screen. It doesn't move the cursor
unless it scrolls off the screen.


#vi