Bash Script to obtain latest image

**burnclouds** · 08-25-2008

I need a bash script to get the latest image from "http://radar.weather.gov/RadarImg/NCR/ABX/"

I know about wget but I'm not sure how to script this so it automatically gets the latest and only get any new file since the last DL. I will have a cron job to trigger off the script.

I will also be using lines like:

Code:

#!/bin/bash
...
#Get latest image(s)
...
#re-create animated gif adding new frame
if [ -ne anim.gif ]
   gifsicle -merge --loop --optimize=2 --disposal=previous * > anim.gif
else
   for i in $NEW_FILE
       gifsicle --merge --append $NEW_FILE --loop --optimize=2 --disposal=previous anim.gif > anim.gif
fi

to create an animated gif from all the collected images.

this file will be used in an internal webpage looking like:

Code:

<html>
   <head>
      <meta http-equiv="refresh" content="120">
      <style rel="stylesheet" type="text/css">
         #image0, #image1, #image2, #image3, #image4, #image5, #image6, #image7, #image8, #image9 {position:absolute; left:9px; top:9px;}
         #image0 img, #image1 img, #image2 img, #image3 img, #image4 img, #image5 img, #image6 img, #image7 img, #image8 img, #image img9 {border-style:none;}
      </style>
   </head>
   <body>
      <div>
         <div style="visibility: visible;" id="image0"><img style="z-index: 0;" src="http://radar.weather.gov/Overlays/Topo/Short/ABX_Topo_Short.jpg" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <!-- <div style="visibility: hidden; " id="image1"><img style="z-index: 1;" src="http://radar.weather.gov/RadarImg/N0R/ABX_N0R_0.gif" name="conditionalimage" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <div style="visibility: visible;" id="image1"><img style="z-index: 1;" src="http://radar.weather.gov/RadarImg/NCR/ABX_NCR_0.gif" name="conditionalimage" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div> -->
         <div style="visibility: visible;" id="image1"><img style="z-index: 1;" src="http://SERVER/radar/anim.gif" name="conditionalimage" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <div style="visibility: visible;" id="image2"><img style="z-index: 2;" src="http://radar.weather.gov/Overlays/County/Short/ABX_County_Short.gif" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <div style="visibility: hidden; " id="image3"><img style="z-index: 3;" src="http://radar.weather.gov/Overlays/Rivers/Short/ABX_Rivers_Short.gif" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <div style="visibility: visible;" id="image4"><img style="z-index: 4;" src="http://radar.weather.gov/Overlays/Highways/Short/ABX_Highways_Short.gif" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <div style="visibility: visible;" id="image5"><img style="z-index: 5;" src="http://radar.weather.gov/Overlays/Cities/Short/ABX_City_Short.gif" alt="Latest radar image from the Wilmington, OH radar and current weather warnings"></div>
         <div style="visibility: visible;" id="image6"><img style="z-index: 6;" src="http://radar.weather.gov/Warnings/Short/ABX_Warnings_0.gif" alt="Latest radar image from the Wilmington, OH radar and current weather warnings" border="0"></div>
         <div style="visibility: visible;" id="image7"><img style="z-index: 7;" src="http://radar.weather.gov/Legend/N0R/ABX_N0R_Legend_0.gif" name="conditionallegend" alt="Latest radar image from the Wilmington, OH radar and current weather warnings" border="0"></div>
      </div>
   </body>
</html>

Thanks for your help.

**secondmouse** · 08-26-2008

for the "getting the latest images" part, you can use wget this way:

Code:

wget -O - http://radar.weather.gov/RadarImg/NCR/ABX/ | awk  '/Apache/{f=0}{$1=$1} !/^$/ && f; /Parent/{f=1};' FS="<[^>]+>|\n+" index.html | awk '!/^[ \n]+$/{print $1}' | while read F
do
  wget http://radar.weather.gov/RadarImg/NCR/ABX/$F
done

**burnclouds** · 08-26-2008

A copy past from the man page (which for wget is HUGE)

Code:

You want to download all the GIFs from a directory on an HTTP server. You tried wget http://www.server.com/dir/*.gif, but that didn't work because HTTP retrieval does not support globbing. In that case, use:

    wget -r -l1 --no-parent -A.gif http://www.server.com/dir/

    More verbose, but the effect is the same. -r -l1 means to retrieve recursively, with maximum depth of 1. --no-parent means that references to the parent directory are ignored, and -A.gif means to download only the GIF files. -A "*.gif" would have worked too.

So here is what I have so far (please help me optimize this)

Code:

cd /opt/radar/images
wget -nH -nd -nc -r -l1 --no-parent -A.gif "http://radar.weather.gov/RadarImg/NCR/ILN/"
rm anim.gif
gifsicle -merge --loop --disposal=previous * > anim.gif

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