Change Wallpaper Script

#!/bin/bash
# Get the current date
DATE=`date +"%H"`
NAME="Sunrise.jpg"

BASE_FOLDER=`dirname $0`

# Figure out the image that it should be
if [ "$DATE" -ge 5 ] && [ "$DATE" -lt 10 ]; then # 5am to 10am
  NAME="Sunrise.jpg"
elif [ "$DATE" -ge 10 ] && [ "$DATE" -lt 16 ]; then # 10am to 4pm
  NAME="Day.jpg"
elif [ "$DATE" -ge 16 ] && [ "$DATE" -lt 21 ]; then # 4pm to 9pm
  NAME="Sunset.jpg"
elif [ "$DATE" -ge 21 ] || [ "$DATE" -lt 5 ]; then # 9pm to 5am
  NAME="Night.jpg"
fi

# Figure out the current one
CURRENT=`sqlite3 ~/Library/Application\ Support/Dock/desktoppicture.db "select value from data" | sed 's,'"$BASE_FOLDER/\(.*\)"',\1,' | uniq`

# If they're different, update!
if [[ $NAME != $CURRENT ]]; then
  sqlite3 ~/Library/Application\ Support/Dock/desktoppicture.db "update data set value = '$BASE_FOLDER/$NAME'" && killall Dock
fi