4. Summary

In this lesson, you first learned about the login shell, some commonly used shell programs, and how to use the shell to interact with the underlying operating system on a UNIX, or UNIX-like, computer.

Next, you learned about environment variables, how they affect the user environment on your computing resource, and how to modify them to customize your user environment. As the complexity of your environment increases, setting your environment variables this way will become cumbersome. In the next lesson, you will learn a simpler way that uses the Environment Modules package.