Fluxbox - Slideshow de wallpapers aleatórios

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#!/bin/zsh -f
#
# Fluxbox - Slideshow de wallpapers aleatorios =)
# 
# Sandro Marcell <sandro_marcell@yahoo.com.br>
# Boa Vista, Roraima - 15/02/2010
#
# Agendamento via cron:
# 0-59/15 * * * * DISPLAY=:0.0 /path/script
# 
# Dependencia:
# feh - image viewer and cataloguer <https://derf.homelinux.org/projects/feh/>
#
PATH="/bin:/usr/bin:/usr/local/bin"

[ $DISPLAY ] || exit 1
RANDOM=$$

wallpapers_dir="${HOME}/imagens/wallpapers" # Altere conforme o seu!
walls=(${wallpapers_dir}/*) 
last_used_wallpaper=${(f)$(<${HOME}/.fehbg)}

function arrayShuffle {
   integer n k
   typeset -a array swap

   array=(${*=})
   (( n = $#array + 1 ))

   while (( n > 1 ))
   do
      (( --n ))
      (( k = (RANDOM * n / (32767 + 1)) + 1 ))
      swap+=($array[k])
      array[k]=$array[n]
      array[n]=$swap
   done

   randomized=($swap[@])
}

arrayShuffle "$walls[@]:t"

while true
do
   {
      (( wallpaper = (RANDOM * $#walls / (32767 + 1)) + 1 ))
      [[ "$randomized[wallpaper]" == "${last_used_wallpaper##*/}" ]] && continue
   } always {
      feh --bg-scale "${wallpapers_dir}/$randomized[wallpaper]" && xrefresh 
      break
   }
done

exit $status