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4
Navigating and Essential 
Commands
At this point in our journey, we've already covered a lot of ground—we've learned 
how to deploy an Ubuntu server, how to manage users, and most recently, how to 
manage software packages. Before we go too far, we should take a moment to learn 
some important concepts and commands that will allow us to build more of the 
foundational knowledge that will serve us well for the remainder of the book and 
beyond. These foundational concepts include core Linux commands for navigating 
the shell, the Linux filesystem layout, viewing the contents of files, and even 
checking on log files. Specifically, this discussion will include:
•  Learning essential Linux commands
• 
Understanding the Linux filesystem layout
• 
Viewing the contents of files
• 
Viewing application log files
Let's take some time to learn some essential Linux commands that will help 
strengthen our command-line skills.

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Navigating and Essential Commands