what does this mean ?

ishare <[email protected]> Fri, 15 Mar 2013 09:03:19 +0800

Newsgroups	gmane.editors.sed.user
Message-ID	<[email protected]>

  sed '/^$/d;G'
   
  1. what is ^$ meaning ? 
  2. what is ; meaning?
  3. what is G meaning ?

  thanks!

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