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Learning essential Linux commands
Building a solid competency on the command line is essential and effectively gives 
any system administrator or engineer superpowers. Our new abilities won't allow 
us to leap tall buildings in a single bound but will definitely enable us to execute 
terminal commands as if we're ninjas. While we won't master the art of using the 
command line in this section (that can only come with years and experience), we will 
definitely become more confident.
First, let's talk about moving from one place to another within the Linux filesystem. 
Specifically, by "Linux filesystem," I'm referring to the default structure of the various 
folders (also referred to as "directories") contained within your Ubuntu installation. 
The Linux filesystem contains many important directories, each with their own 
designated purpose, which we'll talk about in more detail later in this chapter. Before 
we can explore that further, we'll need to learn how to navigate from one directory 
to another. The first command we'll cover in this section relative to navigating the 
filesystem will clarify the 
directory you're currently working from. For that, we have 
the 
pwd
 command. This stands for