Customizing the OS X terminal intro and prompt
When you open a new terminal, OS X greets you with “Welcome to Darwin!”.
You can change this intro by changing ‘the message of the day’ in
/private/etc/motd.
If you like to, you can add some fancy ascii art.
You can also change the prompt. In ~/.profile add the following line:
PS1="\u@\h:\w ".
This prints the username, the hostname and the current working directory. There are other switches you can use.