By default, the shell prompt on Mac OS X is somewhat cluttered so I customised it to be nice and minimalistic.
Open your terminal
Open your bash profile:
In your bash profile file, add the following on a new line:
export PS1="\$ \w: ".
\wgives the Current working directory. If you are not root,
$. If you are logged in as root, you get a
Logout from your Mac’s user session and log back in.
More on how to further customise your shell prompt.