key bindings - In vim, why is 'j' used for down and 'k' for up? -


i've been using vim many years , have never thought it. friend of mine asked why is, noting in our culture, left map while right map down, making vim keys backwards. understand on home row, meaning not have move fingers anywhere hit them, that's different point altogether. basically, question is: know why these keys given present purposes? great if point me documentation on decision well.

the answer in wikipedia entry vi. bill joy, wrote visual mode of ex - ended being vim precursor vi - used lear siegler adm3a terminal on h, j, k, l keys mapped left, down, up, right - , been way ever since.

here's keyboard layout:

enter image description here

a couple of other points of note on adm3a layout:

  • left of q: escape key - handier on keyboards today, hence choice switching between normal , insert modes.
  • top right: 'home' key doubles tilde (~), subsequently became shorthand unix user's home directory.

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