Could you clarify your question please?
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a friend created an IP address for me
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Did he give you his Internet IP address? Does it mean instead that you are on the same LAN and he told you which IP address to use?
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where do I find the Host in Linux in order to put the IP address
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Where is your friend--on the Internet or on a local LAN. What service or port is he offering?
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If he is on the internet, and he gave you an IP address, then you don't need his domain name. He may not have one anyway. You can simply add his IP address and hostname to your /etc/hosts file. Suppose he has an FTP server set up at that IP address. You could then use the hostname you added instead of remembering the IP address in order to access his FTP server.