Originally created by kalkun

getwallpaper

#!/bin/bash

# Syntax:
#
#   getwallpaper [subreddit] [new/rising/hour/day/month/year/all]
#
# By default getwallpaper will fetch images that are hot from r/wallpapers
# If the first option is used but not the second then
# an image from r/[subreddit] sorted after hot, will be fetched.
#
# Example usage:
#
#   getwallpaper art new
#
# This will get newly posted images from r/art
# Otherwise:
#
#   getwallpaper art hour
#
# Will get top voted images from r/art in the latest hour

## change this to change the download folder
## need to be from root in gnome-3


location=~/background/images/

## change this to change the location of the logfile
logfile=~/background/log/log

## change this to change location of dump file
dump=~/background/dump/tmp

stamp=$(date +%F%t%R )
echo Starting script getwallpapers at $stamp >> $logfile

## choose one of these lines 
if [ $# -eq 1 ]; then
  ImGur=$(curl -Gs "http://www.reddit.com/r/$1")
elif [ $# -eq 2 ]; then
  if [ $2 = "new" -o $2 = "rising" ]; then
    ImGur=$(curl -Gs "http://www.reddit.com/r/$1/$2")
  else
    ImGur=$(curl -Gs --data "sort=top&t=$2" "http://www.reddit.com/r/$1/top/")
  fi
else
  ImGur=$(curl -Gs  "http://www.reddit.com/r/wallpapers")
fi

ImGur1=$(echo -e $ImGur | egrep -o "http://imgur.com/[0-9a-zA-Z]*(/[0-9a-zA-Z])*" | egrep -m 1 ^.*$)
ImGur2=$(echo -e $ImGur | egrep -io "http://([0-9a-gi-z]|h[-0-9a-su-z_\./]|ht[-0-9a-su-z_\./]|htt[-0-9a-oq-z_\./]|[-_\./0-9])*(jpg|jpeg)" | sed '/^.*thumb.*$/ d' | cut -c 8- | egrep -m 1 "^.*$")

#un-/comment to dump raw scraped data
echo $ImGur > $dump

if [ -n "$ImGur1" -o -n "$ImGur2" ]; then
  if [ -z $ImGur2 ]; then
    DlLink=$(curl -Gs $ImGur1 | egrep -o "<img.*>" | sed '/<img.*thumb.*>/ d' | egrep -o "i.imgur\.com.*\.[a-zA-Z]{1,4}" | egrep -m 1 ^.*$)
  else
    DlLink=$ImGur2
  fi
else
  echo failed to get an imgur link from the original reddit feed >> $logfile
fi

## The next two lines is because Cron needs strict environment variables to be
## set so the following lines is finding the process ID of the current 
## gnome-session and then setting just that for the cron environment.
PID=$(pgrep gnome-session)
export DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$PID/environ|cut -d= -f2-)

# check if DlLink is not empty before applying new background
if [ -n "$DlLink" ]; then
  name=$( echo $DlLink | sed 's/\//_/g' )
  if [ ! -e "$location$name" ]; then
    echo -e Downloading from: "\n"http://$DlLink >> $logfile
    wget -O $location$name "http://$DlLink"
    gsettings set org.gnome.desktop.background picture-uri "file://$location$name"
    gsettings set org.gnome.desktop.background picture-options "scaled"
    echo -e using: "\nfile://location$name" >> $logfile
  else
    echo -e Nothing new "\n"Link to picture: "\n"http://$DlLink >> $logfile
    echo -e Still using: "\nfile://location$name" >>  $logfile
    gsettings set org.gnome.desktop.background picture-uri "file://$location$name"
    gsettings set org.gnome.desktop.background picture-options "scaled"
  fi
else
  echo failed to read link. DlLink is empty >> $logfile
fi

echo -------------------------------------------------------------------------------- >> $logfile

Installer

#!/bin/bash

#Checks for folder existence
#Creates folder if it does not exist
function checkFolder
{
	if [ -e "$1" ]; then
		printf "Excellent - $1 directory already exists\n"
	else
		mkdir "$1"
		if [ -e "$1" ]; then
			printf "Excellent - $1 was created successfully\n"
		else
			print "Failed to create $1 - Aborting\n"
			exit
		fi
	fi	
}

function checkDependency
{
	res="$(which $1)"
	if [ "$res" != "" ]; then
		printf "Excellent - $1 is already installed\n"
	else
		printf "Excellent - I get to install $1\n"
		printf " --- --- \n"
		sudo apt-get install $1
		printf " --- --- \n"
	fi
}


printf "Excellent - Checking for folders\n"
base=~/background
baseimg="$base/images/"
baselog="$base/log/"
basedump="$base/dump/"
cronTmp="$base/crontmp"

src="https://gist.githubusercontent.com/kalkun/8378148/raw"
dest="/usr/bin/background"

checkFolder $base
checkFolder $baseimg
checkFolder $baselog
checkFolder $basedump

checkDependency curl
checkDependency wget

printf "Excellent - Will now attempt to download background\n"
if sudo wget -O $dest $src; then
	printf "Excellent - background collected!\n"
	sudo chmod +x $dest
	if sudo [ "crontab -e" ]; then
		printf "Excellent - You have a crontab\n"
		c=`crontab -l`
		if [[ $c == *background* ]]; then
			printf "Excellent - Your crontab already contains background\n"
		else
			printf "Excellent - I get to setup your crontab\n"
			crontab -l > $cronTmp
			echo "*/15 * * * * background" >> $cronTmp
			crontab $cronTmp
			rm $cronTmp
		fi
	else
		printf "Failed to find your crontab\n"
	fi
	printf "Excellent - Executing background for the first time\n"
	background
else
	printf "Failed to download background\n"
fi
if [ $0 == "./installer.sh" ]; then
	rm $0
else
	printf "Failed to remove script\n"
fi

This version of getwallpaper is developed for Ubuntu
The easiest way to install is via the terminal by copying the following lines into your terminal

wget -O installer.sh https://gist.githubusercontent.com/Rainnwind/7c6e782078c894e46c49/raw/Installer &&
chmod +x installer.sh &&
./installer.sh