"jj": vi-movement-mode
"jk": vi-movement-mode
-"\C-p": previous-history
-"\C-n": next-history
+# <Up>/<Down> with the additional effect that only lines starting with the
+# current input are matched. Very useful to recall old commands quickly - just
+# type the first few characters.
+"\C-p": history-search-backward
+"\C-n": history-search-forward