#!/bin/bash#Description: # download national geographic photo of the day and set it as background# wait for network connection to be established[[ -n $1 ]] && sleep $1resolution=$(xrandr |grep -o ‘current [^,]*‘|tr -d " "|sed ‘s:current::‘)rss=`wget -q -O - http://feeds.nationalgeographic.com/ng/photography/photo-of-the-day/`img_url=$(echo $rss|grep -o "http://[^\"]*exposure[^\"]*"|head -1)img_url=$(echo $img_url|sed "s:360x270:$resolution:")img=/tmp/pod.jpgwget -q -O $img $img_urlcp /tmp/pod.jpg ~/BackGround/`date +%Y%m%d`.jpgcp /tmp/pod.jpg ~/BackGround/today.jpg原文：http://www.cnblogs.com/guochaoxxl/p/7062971.html