Script to Change Wallpaper in LXDE (Lubuntu)

#!/usr/bin/env ruby

##
#
# WallMorpher.rb
# - RedTeaHacker
#
# I wrote this script for LXDE (specifically Lubuntu) because cortina,
#   desktop-nova, and wallch all did not work.
# To my surprise, the Ruby process had the 2nd to last lowest CPU and memory
#   consumption in the System Monitor when testing this, so it shouldn't
#   hurt performance at all (except for a minor spike every 10 minutes).
#
# Usage (start up automatically):
# - chmod +x WallMorpher.rb
# - sudo mv WallMorpher.rb /usr/local/bin/
# - vim ~/.config/autostart/wall-morpher.desktop:
#     [Desktop Entry]
#     Version=1.0
#     Name=Wall Morpher
#     Comment=Changes wallpaper every few minutes.
#     Exec=WallMorpher.rb
#     Terminal=true
#
##

DIR=File.expand_path('~/Pictures')
SECS=60 * 10 # 10 minutes

loop do
  files=Dir.glob("#{DIR}/*.*") # Inside loop so that it picks up new files
  file=files[rand(files.length)]
  system "pcmanfm --set-wallpaper '#{file}'"
  sleep SECS
end