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Date: Thu, 1 Jul 2004 16:45:20 -0700 (PDT)
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On Thu, 1 Jul 2004, Fabiano Sidler wrote:

> I wouldn't believe it, if there were not a solution. But where? ;)

updir() {
  print -z "$PREBUFFER$BUFFER"
  BUFFER=''
  zle redisplay
  cd ..
  zle send-break
}

Problems:

It beeps at you.

It's crude about handling the input at the PS2 prompt.

It doesn't maintain cursor position if you aren't at the end of the input.