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Having to remember to type in export PATH=$PATH:$HOME/bin every time you start a new shell is... burdensome. Luckily, it's easy to make it semi-permanent by editing the .profile_user file that exists in your $HOME directory. If you open it in a text editor, add the line export PATH=$PATH:$HOME/bin, save, and re-login to Lonestar you will find that your PATH automatically includes $HOME/bin.
Let's move on now to the next section: The modules system