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NCurses Disk Usage
 utility (or more simply, the 
ncdu
). The 
ncdu
 command is one of 
those things that administrators who constantly find themselves dealing with disk 
space issues learn to love and appreciate. In one go, this command gives you not 
only a summary of what is eating up all your space, it also gives you an ability to 
traverse the results without having to run a command over and over while manually 
traversing your directory tree. You simply execute it once and then you can navigate 
the results and drill down as far as you need.
To use 
ncdu
, you will need to install it as it doesn't come with Ubuntu by default:
sudo apt install ncdu
Once installed, simply execute 
ncdu
 in your shell from any starting directory of your 
choosing. When done, simply press 
q
 on your keyboard to quit. Like 
du
, 
ncdu
 is only 
able to scan directories that the calling user has access to. You may need to run it as 
root
 to get an accurate portrayal of your disk usage.
You may want to consider using the 
-x
 option with 
ncdu
. This 
option will limit it to the current filesystem, meaning it won't scan 
network mounts or additional storage devices; it'll just focus on the 
device you started the scan on. This can save you from scanning 
areas that aren't related to your issue.

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Chapter 8