Use NASA / NationalGeographic IOTD as background wallpaper

nasabackground.sh

#!/bin/bash
 
# grabs the nasa image of the day by RSS feed and updates the gnome
# background. add this to your cron jobs to have this happen daily.  this is,
# obviously, a hack, that is likely to break at the slightest change of NASA's
# RSS implementation. yay standards!

#EDITED FOR feh
 
rss=`wget -q -O - http://www.nasa.gov/rss/lg_image_of_the_day.rss`
 
img_url=`echo $rss | grep -o '<enclosure [^>]*>' | grep -o 'http://[^\"]*'`
 
img_name=`echo $img_url | grep -o [^/]*\.\w*$`
 
# this command is benign if the directory already exists.
mkdir -p $HOME/.cache/backgrounds
 
# this command will overwrite the image if it already exists
wget -q -O $HOME/.cache/backgrounds/$img_name $img_url
 
feh --bg-fill $HOME/.cache/backgrounds/$img_name

ngbackground.sh

#!/bin/bash
 
rss=`wget -q -O - http://photography.nationalgeographic.com/photography/photo-of-the-day/`
 
img_url=`echo $rss | grep -o '<div class="download_link"><a[^>]*>'| grep -o 'http://[^\"]*'`
 
img_name=`echo $img_url | grep -o [^/]*\.\w*$`
 
# this command is benign if the directory already exists.
mkdir -p $HOME/.cache/backgrounds
 
# this command will overwrite the image if it already exists
wget -q -O $HOME/.cache/backgrounds/$img_name $img_url
 
feh --bg-fill $HOME/.cache/backgrounds/$img_name