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The Masochist's Editor: vi
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Basic Traversing:
h, j, k l -- left, down, up, right (most versions allow cursor key movement now)
w, e -- next word, end of next word
i, a -- insertion modes; insert at/after cursor (changes to editing mode so you can start typing)
u -- undo last edit (note depending on version may only have one level of undo)
. -- repeat last edit
x -- delete character under cursor
dw -- delete word under cursor
dd -- delete line under cursor