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Diving deeper into disk usage
The next step in
 investigating what's gobbling up your disk space is finding out 
which files in particular are using it all up. At this stage, there is a multitude of tools 
you can use to investigate. The first I'll mention is the 
du
 command, which is able to 
show you how much space a directory is using. Using 
du
 against directories and sub-
directories will help you narrow down the problem. Like 
df
, we can also use the 
-h
 
option with 
du
 to make our output easier to read. By default, 
du
 will scan the current 
working directory your shell is attached to and give you a list of each item within the 
directory, the total space each item consists of, as well as a summary at the end.

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Chapter 8