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Monitoring an html web page changes

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# 8  
Old 12-20-2012
I've used wget for years reliably. If the file size is different, something probably has changed.

It may not be anything you care about, but a change is a change.

Compare the old and new files with diff and see what you find different.
# 9  
Old 12-20-2012
This may not be related, but I see a bug was identified with wget causing it to report file size inaccurately - Red Hat Bugzilla

They used version-release number: wget-1.9.1-16 to reproduce this. You might have to check your version and try an upgrade if necessary.
# 10  
Old 12-21-2012
Two ways.

1. Take the response header of the Webpage and look for the last modified time
2. If you are specific on what contents to be checked in the Web page[say for example a div part], download and cut that in a txt file and do a checksum with md5 or cksum to compare the change
# 11  
Old 12-21-2012
You can also try
WatchThatPage - Monitor web pages extract new information
It will track any change for you and send you an email when change occurs
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