Your shell has many useful options that can be set to fit your personal preferences. So far, however, we haven't discussed any way to have these settings set up automatically every time you log in, except for re-typing them each time. In this section we will look at tuning your login environment by modifying startup files.

First, let's add a friendly message for when you first log in. To see an example message, run fortune:

$ fortune
No amount of careful planning will ever replace dumb luck.