23 May 16 14:35, you wrote to me:   
      
    ac>> Years ago I wrote a sh script to download a web page, compare it to   
    ac>> a local copy using diff and email me any changes. The script runs   
    ac>> twice a day as a cron job.   
      
    BR> Cool, dig it up and post!   
      
   Here you go...   
      
   #!/bin/sh   
      
   #  webmonitor.sh   
   #   
   #  Monitor web pages for changes and email the diffs.   
      
   WGETOPT="--cache=off --no-check-certificate"   
   ELINKSOPT="-no-references -no-numbering -dump-width 75"   
   DIFFOPT="-uw"   
   BINDIR="/usr/local/bin"   
   WORKDIR="$HOME/bin/cron/webmonitor"   
   MAILTO=$USER   
      
   # Pretend we're Firefox instead of Wget.   
      
   #USERAGENT="Mozilla/5.0 (X11; Linux i686; rv:7.0) Gecko/20100101 Firefox/7.0"   
   #USERAGENT="Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20100101   
   Firefox/10.0"   
   #USERAGENT="Mozilla/5.0 (Windows NT 6.1; WOW64; rv:30.0) Gecko/20100101   
   Firefox/25.0"   
   USERAGENT="Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20100101   
   Firefox/40.0"   
      
   # Check that Wget and ELinks are installed.   
      
   require_util()   
   {   
     if [ ! -f $BINDIR/$1 ]; then   
       echo "$0: $1 is missing!"   
       exit 1   
     fi   
   }   
      
   require_util "wget"   
   require_util "elinks"   
      
   # Get command-line args.   
      
   URL=$1   
   CACHEFILE=$2   
      
   # We require two args, otherwise complain.   
      
   if [ $# -ne 2 ]; then   
     echo "Usage: $0  "   
     exit 1   
   fi   
      
   # Chdir to our working directory, or die trying.   
      
   cd "$WORKDIR"   
      
   if [ $? -ne 0 ]; then   
     echo "$0: Unable to change to working directory: $WORKDIR"   
     exit 1   
   fi   
      
   # Yoink the web page we want.   
      
   wget -U "$USERAGENT" $WGETOPT -O $CACHEFILE.new "$URL"   
      
   # Bail out if Wget failed. This ensures we don't overwrite our old cache.   
      
   if [ $? -ne 0 ]; then   
     echo "$0: Error retrieving $URL"   
     exit 1   
   fi   
      
   # If we don't already have a cached copy from before the Wget then this   
   # is probably our first run, and we don't have much to do except copy   
   # the new file to the old cache.   
      
   if [ ! -f $CACHEFILE.cache ]; then   
     mv $CACHEFILE.new $CACHEFILE.cache   
     exit 0   
   fi   
      
   # We have a cached page and a new page, so run both through ELinks.   
      
   elinks -dump $ELINKSOPT $CACHEFILE.cache > $CACHEFILE.cache.dump   
   elinks -dump $ELINKSOPT $CACHEFILE.new > $CACHEFILE.new.dump   
      
   # We want the dumpfiles to have the same timestamp as their source files.   
   # This is useful as diff will show the timestamps of both files in the   
   # header of the output.   
      
   touch -r $CACHEFILE.cache $CACHEFILE.cache.dump   
   touch -r $CACHEFILE.new $CACHEFILE.new.dump   
      
   # Compare and enjoy.   
      
   diff $DIFFOPT $CACHEFILE.cache.dump $CACHEFILE.new.dump > $CACHEFILE.dump.diff   
      
   # If any changes were detected, send e-mail with the diff as the text.   
      
   if [ $? -ne 0 ]; then   
     cat $CACHEFILE.dump.diff | mail -s "[webmonitor] Changed: $URL" $MAILTO   
   fi   
      
   # Clean up any temp files, and make the newly downloaded web page   
   # become our cached page.   
      
   rm -f $CACHEFILE.cache.dump $CACHEFILE.new.dump $CACHEFILE.dump.diff   
   mv $CACHEFILE.new $CACHEFILE.cache   
      
   --- GoldED+/BSD 1.1.5-b20160201   
    * Origin: Blizzard of Ozz, Melbourne, Victoria, Australia (3:633/267)