Since most users want to have largely the same environment no matter
what type of interactive shell they wind up with, whether or not it's
a login shell, we'll start our configuration by putting a very simple
command into our .bash_profile: ``source
~/.bashrc''. The source command tells
the shell to interprete the argument as a shell script. What it means
for us is that everytime .bash_profile is run, .bashrc is
also run.
Now, we'll just add commands to our .bashrc. If you ever want a command to only be run when you login, add it to your .bash_profile.