Tip
	If you're using SSH,[2] you can skip to Section 1.4, “Shells, the shell prompt, and your home directory”. Recall that graphical applications are unavailable while you're using SSH, unless you're using X tunneling.[3]

Fundamentally, there are two different ways to work with the Linux operating system:

As suggested by the title, this guide focuses on the use of the CLI.

Discussion of GUIs is restricted to Section 1.2, “Graphical user interfaces (GUIs) for Linux”, Section 1.3, “Accessing the Linux CLI through a GUI's terminal window”, and Appendix B, Graphical alternatives.