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When I open up the terminal, I get this instead of my username:

unknown-b8-8d-12-22-27-72% 

Is there any reason why I am getting such username?

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migrated from stackoverflow.com Nov 11 '12 at 20:56

This question came from our site for professional and enthusiast programmers.

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You should post your PS1 string from .bash_profile or .bashrc. That will provide the necessary information for someone to help you out. – BenTrofatter Nov 11 '12 at 19:39
    
what does it say when you issue whoami on the prompt? – sampson-chen Nov 11 '12 at 19:55
    
whoami does post my real username: Malloc – Malloc Nov 11 '12 at 20:21

You can easily fix this by defining your own PS1 (your prompt) by editing the ~/.bashrc config file. An example including your username, hostname, working directory and prompt sign is:

PS1='\u@\h \w \$ '

After editing ~/.bashrc you need to source it to make the changes apply in the current shell:

source ~/.bashrc
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