I have a website www.old.com. I want to remove it from all search engines. I only want to keep it as a reference for personal use. I developed a www.new.com with contents from old.com.
Can I just use robots.txt to inform search engines that old.com is no longer online?
I do not have 1 on 1 mapping of the URLs between these 2 sites. I just want get rid of old.com and use new.com. The old.com is used as a personal reference site.