Sorry if this has been discussed to death, but I honestly can't find anything that directly helps with what I am trying to do, therefore any help is appreciated.
I have multiple domains pointed at my website all related in a sense to the particular industry my site is aimed at! But after reading many topics here about how google can penalize for this, I have decided to create an .htaccess for the root of my server that redirects all the domains to only one! i.e. domain1.com domain2.com domain3.com are shown in the address bar of the browser, how can I do a redirect so that every domain redirects and shows domain1.com in the address bar?