If you want your script to run every time you run a terminal then put it in your .bashrc. Put it in your .bash_profile if you only want it to run for login purposes. It's better to keep your .bash_profile clean. You can put...
Code:
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
In your .bash_profile and it'll read your .bashrc file when you log in and every time you launch a terminal.