https://mattmazur.com/2012/01/27/how-to-change-your-default-terminal-prompt-in-mac-os-x-lion/

How to Change Your Default Terminal Prompt in Mac OS X Lion

Posted on January 27, 2012 by Mazur. This entry was posted in Tutorial. Bookmark the permalink.
By default, when you open up a new Terminal window in Mac OS X the command prompt displays a relatively long name:

I prefer to shorten this to a simple dollar sign ($) in order to free up space.
To change your default command line prompt, follow these instructions:
1) Navigate to your home directory:
cd ~
2) Create a file called .bash_profile
vi .bash_profile
3) Add the following line (press i)
export PS1="$ "

4) Save the file (press Escape, type :wq and hit Enter)
5) Restart Terminal
You should now see something like this:

There are other ways you can configure the command prompt (for example, showing the current time), but I prefer to keep it simple.

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