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Viewing disk usage
Keeping an eye on your storage is always important, as no one enjoys getting a call 
in the middle of the night saying that a server encountered an issue, especially not 
something that could've been easily avoided, such as a filesystem growing too close 
to being full. Managing storage on Linux systems is simple once you master the 
related tools, the most useful of which I'll go over in this section. In particular, we'll 
look at tools we can use to answer the question "what's using up all the disk space?", 
which is the most common question that comes up when dealing with disk usage.
First, let's look at the 
df
 command. 
Using df
The 
df
 command is likely always going to be your starting point in situations where 
you don't already know which volume or mount point is becoming full. When 
executed, it gives you a high-level overview, so it's not necessarily useful when you 
want to figure out who or what in particular is hogging all your space. However, 
when you just want to list all your mounted volumes and see how much space is left 
on each, 
df
 fits the bill. By default, it shows you the information in bytes. However, I 
find it easier to use the 
-h
 option (which produces a human-readable output) with 
df
 
so that you'll see information that's a bit easier to read. Go ahead and give it a try:
df -h
This should produce an output that looks something like the following:
Figure 8.1: Output from the df -h command

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Chapter 8