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This behavior is consistent across all environments where I have used Vim (Cygwin, Putty, VC, xterm & co). I realize that it has something to do with the way input is read and the representaion of , but I'm not sure exactly why the key combination d + deletes two lines of text. Care to shed some light on this matter?

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If you had told us what you expect instead, we could better correct your misunderstanding. – Ingo Karkat Apr 3 '13 at 13:54
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I'd like to stick up for the OP - it's not obvious to me why it's two lines... rather than just the single character of D+left and D+right – Joe May 5 '13 at 9:37
    
@Joe, thanks, but it's not a good question and kinda does deserve a couple of down votes. The answer depends on design choice as much as anything else.. I was more confused about why arrow keys behave differently on some terminals than why "d-down" deletes two lines. Perhaps I'll ask/answer the "real question" properly some time in the future. – Ярослав Рахматуллин May 5 '13 at 10:27
up vote 4 down vote accepted

D and a cursor movement, deletes in that direction. It's just a standard binding.

D with H, J, K, L works the same way as the arrow keys.

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Exactly. d + down deletes two lines because that is how vim is supposed to work. – cpast Apr 3 '13 at 13:52
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Yes, silly confusion, it makes perfect sense. Let's contemplate the validity of the expression "There are no stupid questions ..." – Ярослав Рахматуллин Apr 3 '13 at 15:03
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It's actually inconsistent - D+left and D+right delete one character, whereas D+up and D+down delete two lines. So no, it's not a stupid question. – icabod Apr 4 '13 at 8:32

dd and :d deletes the current line, and d in visual mode deletes the highlighted text. When you move down a line holding d, you may be highlighting both lines, which then deletes them due to how VIm handles the d button press.

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That behavior is consistent across systems because it is perfectly normal. What in all hell are you expecting dj or d<down> to do?

d is an "operator pending command": after it is pressed, Vim waits for a motion to apply the command to. Since you give it the <down> motion, d<down> deletes the current line and the line below.

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I could expect a number of things. None of them are naturally associated with hell. – Ярослав Рахматуллин Apr 3 '13 at 15:00

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