#!/bin/sh
if [ ! -L "$2" ]; then
  ln -sFfh ./ "$2"
fi
if [ ! -d "$1" ]; then
  echo "$0: $1 does not exist"
  exit 1
fi
while true; do
  RND=`rnd`
  if [ -e "$2.$RND" ]; then continue; fi
  mv "$1" "$2.$RND"
  ln -sFfh "$2.$RND" "$2"
  ls -d "$2".* | grep -v "$2.$RND" | xargs rm -rf
  break
done